Pertanyaan

 

Pertanyaan

Sampaikan pertanyaan menganai kesulitan belajarmu kepada tim narasumber yang kompeten. Kamu harus login JSS terlebih dahulu untuk mengajukan pertanyaan, klik di sini untuk login JSS

 
16 Maret 2009
Pu3
IPA Kelas 9

Assalamualaikum.. apa sih yg dimaksud Kloning, Kultur jaringan, Transgenik, Inseminasi ?

Kloning reproduksi buatan dengan cara  sel telur dibuang intinya dan diganti dengan  inti sel somatis. Contoh cloning kambing dolly sel telur kambing dibuang intinya dan diganti dengan inti sel somatis yang diambil dari kelenjar susu.

Kultur jaringan tehnik reproduksi buatan dengan cara mengisolasi bagian tanaman kemudian menumbuhkan bagian tersebut secara aseptis sehingga bisa berkembang menjadi tanaman yang lengkap.

Transgenik suatu metode dengan menggabungkan  gen yang dikehendaki kedalam suatu organisme. Hasil penggabungan DNA dari individu yang tidak sama ini disebut DNA rekombinan.

Inseminasi merupakan tehnik reproduksi generativ dengan  adanya peleburan gamet. Pada inseminasi buatan sperma bisa diambil dari organisme lain yang berbeda varietasnya.


RR.RETNO YOSIANI T SARI, S.Pd.

15 Maret 2009
nora
Bahasa Inggris Kelas 11

bu/pak tlong donk buatin q HORATORY EXPOSITION topiknya FASHION SHOWS OUR IDENTITY. . q mhon banget bantuannya. . makasih sebelumnya

Watch your Kids While Watching TV
Television becomes one of the most important devices which takes place in almost houses. It can unite all members of the family as well as separate them. However, is it important to know what your kids are watching? The answer is, of course, absolutely "Yes" and that should be done by all parents. Television can expose things you have tried to protect the children from, especially violence, pornography, consumerism and so on.
Recently, a study demonstrated that spending too much time on watching TV during the day or at bedtime often cause bed-time disruption, stress, and short sleep duration.
Another research found that there is a significant relationship between the amount of time spent for watching television during adolescence and early adulthood, and the possibility of being aggressive.
Meanwhile, many studies have identified a relationship between kids who watch TV a lot and being inactive and overweight.
Considering some facts mentioning above, protect your children with the following tips:
  • Limit television viewing to one-two hours each day
  • Do not allow your children to have a TV set in their own bedrooms
  • Review the rating of TV shows which your children watch
  • Watch television with your children and discuss what is happening in the show

Notes on the Generic Structure of this Hortatory Exposition example
Firstly, we have to always remember that the social function of hortatory exposition text is driving the readers to act like the writer thought as stated in the text. Then the purpose of this hortatory is influencing and persuading the readers by presenting the supporting arguments. In many social activities, hortatory is applied for writing recommended thought, sales letter, advertising, speech campaign, and news advertorial.
Thesis: The writer's thought is presented as thesis which is proven with several arguments. In the first paragraph, the writer points his thought about the importance of accompanying children while they are watching TV show. It is important to protect the children from the bad influences of TV show.
Arguments: The next paragraphs show the writer arguments in supporting his thesis. It is supported by various researches that there are a great relationship between watching TV and the watcher's personality. One study describes that much time in watching TV can cause bed-time disruption. The others show the possibility of becoming an aggressive character because of watching television too much.
Recommendation: After stating the thesis and proving with various arguments, the text is completed with the writer's recommendation on how the parents should protect the children from the bed effect of watching TV.
Basically, both hortatory and analytical exposition have the similar position. Both take place as argumentative essays. Both show how important idea of the writer to be known. However the last paragraph of the essay usually make the difference from hortatory and analytical exposition. If it is a hortatory text, it will be ended with a strong recommendation while for analytical exposition, it will be closed with restatement of the writer's first paragraph.

 

Jul9

More Dust Bins is Cleaner; example of hortatory

To improve comfort and cleanliness at the school, there should be an increasing number of dust bins.

When we look at classroom, school corridors and schoolyard, there papers, mineral water cops, straws, and napkin everywhere. The condition of unseemliness really hinders learning and teaching environment. They can be filled out with water coming from the rain. This can be placed for mosquito to spread out.

Anyway I notice that most of the students have responsibilities for their school environment. They put their litter on the proper place but some of them are not diligent enough to find the dust bins. The numbers of the dust bins in the school are not enough. More dust bins should be put beside each step, outside of the classrooms and some along of the corridors. Probably one dust bin should be in every ten meters. So when students want to throw away their litters, they can find the dust bins easily.

When school is equipped with sufficient dust bins, students do not have problem of discomfort any more. So provide more dust bins and school will be very clean and become a very nice place to study.

 

Jun9

Where should be after High School?; a hortatory text

The National examination result will be publicly enounced in next short time. Euphoria will flood for those who get success. In the other hand, It will be sorry to hear that there are some of them do not succeed in their national final examination. For those who succeed soon will think to decide; where will they be after graduating high school? Actually it will be easy to decide for those has been arranged and thought earlier but for those have not planed yet, it will be quite confusing.

Continuing study or looking for work is the primary choice among them. When they think about continuing study, they will think hard about the time and cost. How long the higher study will last? And how high is about the cost. In the same way, when they think about straightly seeking job, what skill and competence they have got is a big matter of questioning. So, doing both choices in the same time is an alternative.

Continuing study as well as seeking job is possibly done but it will be hard for them. Conventionally studying in the university needs much time to spend especially in the first year. It is true because they have to do and adapt a lot of things in their new higher school. it will be very hard to looking for job. Therefore it should come to their mind of continuing studying at higher school from their own home. As result, the available time will be more flexible for them. Then it will be very possible to seek job and get the appropriate one. This type of studying is publicly known as distance learning.

As the alternative method of studying, besides the conventional studying which students and the lecturer have to meet in the fixed time and place regularly, distance learning provides possibility to grow better. Possibly working and studying surely will create high quality graduate. Distance learning should appear as a considerable choice for them.

 

Mar5

Millions from Property Market; a hortatory exposition text

Dear friend,
Are you tired of the daily grind? Sick of working all hours of the day for litle reward? Tired of having enough money to really enjoy yourself? Well, now there is a way out.
We can show the way to give up work. Sit back and make millions for yourself and your loved ones on property market.
Albert Smith felt just like you untill he read our leaflet. Now he drives a sport car arround the South of France and his wife has one of her own too.

Generic Structure Analyse
Thesis; there is a way out of financial problem.
Argument; Albert Smith is the proof.
Recommendation; Join property market !
Language Feature Analysis
Using abstract noun; reward
Using action verb; give up, make, etc
Using thinking verb; felt
Using simple present tense; are you tired?, he drives a sport car, etc

Feb19

Removing Lead from Petrol; a hortatory exposition text

In all the discussion over the removal of lead from petrol (and the atmosphere) there doesn't seem to have been any mention of the difference between driving in the city and the country.
While I realize my leaded petrol car is polluting the air wherever I drive, I feel that when you travel through the country, where you only see the another car every five to ten minutes, the problem is not as severe as when traffic is concentrated on city roads.
Those who want to penalize older, leaded petrol vehicles and their owners don't seem to appreciate that, in the country, there is no public transport to fall back upon and one's own vehicle is the only way to get about.
I feel that the country people, who often have to travel huge distances to the nearest town and who already spend a great deal of money on petrol, should be treated differently to the people who live in the city.

Generic Structure Analysis
Thesis; paragraph 1
Arguments 1; paragraph 2
Argument 2; paragraph 3
Recommendation; paragraph 4

Language Feature Analysis
Focusing on the writer: using the first personal pronoun "I"
Using abstract noun; discussion
Using action verb: treat,
Using thinking verb; think, seem
Using passive voice; should be treated differently
Using simple present tense; there doesn't seem…, there is no public transport.., etc

Dec31

What is Hortatory Exposition?

Hortatory Exposition Text

Definition of Hortatory Exposition
Hortatory exposition is a text which represent the attempt of the writer to have the addressee do something or act in certain way.

Generic Structure of Hortatory Exposition
1. Thesis
2. Arguments
3. Recommendation

Language Feature of Hortatory Exposition
1. Focusing on the writer
2. Using abstract noun; policy, advantage, etc
3. Using action verb
4. Using thinking verb
5. Using modal adverb; certainly, surely, etc
6. Using temporal connective; firstly, secondly, etc
7. Using evaluative words; important, valuable, trustworthy, etc
8. Using passive voice
9. Using simple present tense


Operator

15 Maret 2009
Bahasa Inggris Kelas 12

paragraf analytical exposition 2004

The importance of Reading

 

I personally think that reading is a very important activity in our life.  Why do I say so?  Firstly, by reading we can get a lot of knowledge about many things in the world such as Science, technology. Sports, arts, culture, etc written in either books, magazine, newspaper, etc.

Secondly, by reading we can get a lot of news and information about something happening in any parts of the world which can we see directly.

Another reason, reading can give us pleasure too.  When we are tired, we read books, newspaper or magazine on the entertainment coloumn such as comedy, short story, quiz, etc. To make us relaxed.

The last, reading can also take us to other parts of the world.  By reading a book about Irian Jaya we may feel we’re  really sitting in the jungles not at home in our rooms.

From the facts above, it’s obvious that everyone needs to read to get knowledge, information and also entertainment.  Or in summary we can say reading is truly important in our life.

 

 

Learning English

Learning English through music and songs can be very enjoyable. You can mix pleasure with learning when you listen to a song and exploit the song as a means to your English progress. Some underlying reason can be drawn to support the idea why we use songs in language learning.

Firstly, “the song stuck in my head” Phenomenon (the echoing in our minds of the last song we heard after leaving a restaurant, shopping malls, etc) can be both enjoyable and sometimes unnerving. This phenomenon also seems to reinforce the idea that songs work on our short-and-long term memory.

Secondly, songs in general also use simple conversational language, with a lot of repetition, which is just what many learners look for sample text. The fact that they are effective makes them many times more motivating than other text. Although usually simple, some songs can be quite complex syntactically, lexically and poetically, and can be analyzed in the same way as any other literary sample.  

Furthermore, song can be appropriated by listener for their own purpose. Most pop songs and probably many other types don’t have precise people, place or time reference.

In addition, songs are relaxing. They provide variety and fun, and encourage harmony within oneself and within one group. Little wonder they are important tools in sustaining culture, religion, patriotism and yeas, even revolution.

Last but not least, there are many learning activities we can do with songs such as studying grammar, practicing selective listening comprehension, translating songs, learning vocabulary, spelling and culture.

From the elaboration above, it can be concluded that learning through music and songs, learning English can be enjoyable and fun.

 


Operator

15 Maret 2009
Bahasa Inggris Kelas 12

aslmkum.. Pak,tolong berikan 12 contoh functional text. saya sangat membutuhkannya.. secepatnya.. sebelumnya terimakasih.. wassalam..

Genres

Social Function (Tujuan / Fungsi Sosial)

Generic Structure (Struktur)

Significant Lexicogrammatical Features (Ciri – ciri yang menonjol)

Narrative

To amuse, entertain, and to deal with actual or vicarious experiences in different ways. (Untuk menghibur pembaca melalui cerita).

a. Orientation: Sets the scene and introduces the participants. (Memperkenalkan tokoh dan setting).b. Complication : A crisis arises (Munculnya masalah).c. Resolution : the crisis is resolved (Terselesainya masalah).e. Evaluation : A stepping back to evaluate the plight. (Melangkah ke belakang untuk memikirkan nilai / makna sebuah peristiwa, bisa ada dan tidak)d. Reorientation : Optional (Bisa ada / atau tidak ada fungsinya menyimpulkan isi cerita )a. Focus on specific usually individualized participants. (Fokus pada tokoh – tokoh tertentu secara individu).b. The use of Simple Past (Penggunaan Tenses Masa Lampau)c. The use of temporal conjunction (Penggunaan kata penghubung yang menunjukkan waktu ex : After, before, when dll).d. The use of noun phrases (Penggunaan frasa kata benda yang kaya dengan adjective misalnya : long black hair, two red apples.

Descriptive

To describe a particular person, place or thing (Untuk menggambarkan orang, benda, atau tempat tertentu secara khusus)

a. Identification : Identifies phenomenon ( Mengidentifikasi / pengenalan fenomena / hal yang dideskripsikan).b. Description : Menggambarkan bagian, kualitas, maupun ciri – ciri)a. The Use of Simple Present Tense (Penggunaan Simple Present Tense). b. Focus on Specific Participant (Fokus kepada Hal / orang / tempat secara khusus)

Recount

To tell events for the purpose of informing or entertaining (Melaporkan peristiwa, kejadian atau kegiatandengan tujuan memberitakan atau menghibur)a. Orientation : Provides the setting and introduces the participants (yaitu memberikan informasi tentang apa, siapa, di mana dan kapan). b. Events : Tell what happened in what sequence ( Laporan urutan kegiatan yang biasanya disampaikan secara berurutan)c. Reorientation : Optional – closure of events. (biasanya berisi komentar pribadi / penilaian jika ada a. Use of past tense : Penggunaan waktu masa lampau) b. Focus on temporal sequence (Fokus pada urutan waktu dengan kata – kata penghubung yang menunjukkan waktu mis : when, after, then dsb). c. Noun dan noun phrases.

Genres

Social Function (Tujuan / Fungsi Sosial)

Generic Structure (Struktur)

Significant Lexicogrammatical Features (Ciri – ciri yang menonjol)

Report

To describe the way things are with reference to a range of natural, man – made and social phenomenon in our environment. (Menyampaikan informasi tentang sesuatu, apa adanya, sebagai hasil pengamatan. Yang dideskripsikan dapat meliputi gajala alam, lingkungan, benda buatan manusia, atau gejala-gejala sosial) a. General Classification: tells what the phenomenon under discussion is ( Pernyataan secara umum yang menjelaskan tentang objek yang dideskripsikan. Keterangan, dan klasifikasinya). b. Description : tells what phenomenon under discussion is like in terms of parts, qualities, habits, or behaviors (if living) or uses (if non-natural) (Memberikan penjelasan tentang hal yang dideskripsikan. kalau hal yang dideskripsikan merupakan benda hidup maka bisa dideskripsikan bgian – bagiannya, kualitasnya, kebiasaanya, atau perilakunya. Kalau benda mati maka yang dideskripsikan adalah kegunannya)a. Focus on generic participants : Fokus pada hal secara umum. b. Use of Present Tense (Unless extinct) (Pengunaan Present Tense kecuali kalau benda itu sudah punah.

Procedure

To describe how something is accomplished through a sequence of actions or steps (Menjelaskan bagaimana mencapai sebuah tujuan dengan memberikan serangkaian langkah / tindakkan) a. Goals (Tujuan yang hendak dicapai, biasanya ada dalam judulnya)b. Materials (Bahan – bahan, tidak semua jenis teks Prosedur ada). c. Steps A series of steps oriented to achieve the goal (Sejumlah langkah untuk mencapai tujuan. a. Use of simple present Tense often imperative (Penggunaan Simple Present Tense, sering kali merupakan kalimat perintah). b. Use mainly of temporal conjunction / connectives (penggunaan kata untuk mnerangkan waktu misalnya then, after that) c. Penggunaan action verbs (Cut, Mix.

Analytical Exposition

To persuade the reader or listener that something is the case. (Untuk meyakinkan dan mempengaruhi pembaca atau pendengar bahwa ada masalah yang perlu mendapat perhatian) a. Thesis Position: Introduces topics and indicates writer’s position. (Memberitahukan topic dan menunjukkan pendapat penulis). b. Arguments Points : Menjelaskan argument dan elaborasi (dijelaskan secara mendetailc. Reiteration : Restates writer position : Menjelaskan kembali posisi penulis atau penguatan kembali posisi penulis General nouns, misalnya car, pollution, leaded petrol car, dsb.· Abstract nouns, misalnya policy, government, dsb.· Technical verbs, misalnya species of animals, dsb.· Relating verbs, misalnya It is important, dsb.· Action verbs, misalnya She must save, dsb.· Thinking verbs, misalnya Many people believe, dsb· Modal verbs, misalnya we must preserve, dsb.

 

· Modal adverbs, misalnya certainly, we, dsb.

· Connectives, misalnya firstly, secondly,dsb.

· Bahasa evaluatif, misalnya important, valuable, trustworthy, dsb.

* Kalimat pasif

Hortatory Exposition

To persuade the reader that something should or should not be the case. (Meyakinkan kepada pembaca bahwa sesuatu seharusnya dilakukan atau tidak dilakukan) a. Thesis : announcement of issue concern (Menjelaskan tentang hal yang dibahas) b. Arguments : Reasons for concerns, leading to recommendation (Alasan yang digunakan yang menuju pada rekomendasi tentang apa yang seharusnya / tidak seharusnya dilakukan)c. Statement : statement of what ought or ought not to happen (Pernyataan tentang apa yang seharusnya atau tidak seharusnya terjadi / dilakukan)Terfokus ke pembicara / penulis yang mengangkat isu.· Abstract nouns, misalnya policy, government,dsb.· Technical verbs, misalnya species of animals, dsb.· Relating verbs, misalnya should be, doesn’t seem to be dsb.· Action verbs, misalnya We must act, dsb.· Thinking verbs, misalnya I believe, dsb· Modal verbs, misalnya we must preserve, dsb

 

· Modal adverbs, misalnya certainly, wem dsb.

· Connectives, misalnya firstly, secondly, dsb

· Simple present tense

· Kalimat pasif

· Bahasa evaluatif, misalnya important, valuable, trustworthy, dsb.

Review

To critique an art work, event for a public audience. It includes movies, TV shows, books, plays, operas, recordings, exhibitions, concerts, and ballets. (Melakukan kritik terhadap peristiwa atau karya seni untuk pembaca atau pendengar halayak ramai, misalnya film, pertunjukan, buku, dll.) a. Orientation: places the work in its general context often by comparing it with others of its kind (Menempatkan karya tersebut dalam konteks secara umum seringkali dengan membandingkan karya lain yang sejenis). b. Interpretive Recount: summarizes the plot or / and provides an account of how the reviewed rendition of the work came into being. (Memberikan ringkasan alur dan atau Menafsirkan karya itu, struktur ini biasa ada atau tidak ada dalam suatu review). c. Evaluation : Provides an evaluation of the work and / or its performance or production (Memberikan evaluasi tentang karya atau pementasannya).
  • Terfokus pada partisipan tertentu;
  • Menggunakan:
  • adjectives menunjukkan sikap, seperti bad, good;
  • klausa panjang dan kompleks;
  • metafor.

Discussion

To present (at least) two points of view about an issue (Membahas suatu maslah yang paling tidak dipandang dari dua sudut pandang) a. Issue : Statement (Pernyataan tentang hal yang dibahas) b. Arguments for and against or statemetn of differingv points of view (Argumen yang mendukung atau melawan pernyataan). c. Point d. Elaboration (Penjelasan) e. Conclusion or Recommendation (Ringkasan atau rekomendasi) a. general nouns untuk menyatakan kategori, misalnya uniforms, alcohol, dsb,b. relating verbs untuk memberi informasi tentang isu yang didiskusikan, misalnya smoking is harmful, dsb.c. thinking verbs untuk mengungkapkan pandangan pribadi penulis, misalnya feel, believe, hope, dsb.d. additives, contrastives dan causal connectives untuk menghubungkan argumen, misalnya similarly, on the hand, however, dsb.e. detailed noun groups untuk memberikan informasi secara padu, misalnya the dumping of unwanted kittens, dsb.f. modalities, seperti perhaps, must, should, should have been, could be, dsb.g. adverbials of maner, misalnya deliberately.

News Item

To inform readers, listeners, or viewers about events of the day which are considered newsworthy or important (memberitahukan kepada pembaca, pendengar, atau penonton tentang sebuah peristiwa atau kejadian yang penting). a. Newsworthy events: Penceritaan kembali tentang Ringkasan kejadian. b. Background Events : Menjelaskan apa yang terjadi, kepada siapa dan dalam kondisi seperti apa. c. Source : komentar – komentar oleh para saksi, pelaku, pejabat setempat, atau ahli dalam kejadian tersebut. a. Terfokus pada orang, binatang, benda tertentu;b. Menggunakan action verbs, misalnya eat, run;c. Menggunakan keterangan waktu dan tempat;d. Menggunakan past tense;e. Disusun sesuai dengan urutan kejadian

Explanation

Menerangkan proses yang berlangsung dalam pembentukkan atau pelaksanaan kegiatan yang berhubungan dengan gejala – gelaja / fenomena sosio budaya. a. A general statement : Pernyataan umum b. A sequenced explanation : Penjelasan secara brerurutan mengapa atau bagaimana sesuatu terjadi. a. general dan abstract nouns, misalnya word chopping, earthquakes;b. action verbs;c. simple present tense;d. passive voice;e. conjunctions of time dan cause;f. noun phrase, misalnya the large cloud;g. abstract nouns, misalnya the temperature;

 

h. adverbial phrases;

complex sentences;

bahasa teknis;


Operator

15 Maret 2009
Matematika Kelas 9

rencana suatu pekerjaan bangunan diselesaikan dalam waktu 7 hari oleh 20 orang. pekerjaan terhenti 3 hari mulai hari ke 3. berapa penambahan orang dibutuhkan agar pekerjaan selesai pada waktu yang direncanakan sebelumnya?

 Terima kasih  atas partisipasinya, pertanyaan Anda masuk materi perbandingan berbalik nilai salah satu alternatif jawabannya sebagai berikut :

Berhenti pada hari ke 3 berarti pekerjaan sudah dilaksanakan selama 2 hari. Selanjutnya langkah-langkahnya sebagai berikut :

Banyak hari                            Banyak orang

(7-2) = 5  ----------------------------→    20

(5-3) = 2 -----------------------------→     x

           x = (5:2)x20

              = 50

Jadi penambahan orang yang dibutuhkan agar pekerjaan selesai pada waktu yang direncanakan sebelumnya adalah = 50 - 20 = 30 orang


Surahmanto, S.Pd

14 Maret 2009
pras
Matematika Kelas 9

di dalam suatu lapangan rumput berbentuk persegi dengan sisi 6 m, terdapat taman bunga bebentuk lingkaran dengan diameter 4 m. jika (phi) 3,14 maka luas lapangan yang ditumbuhi rumput adalah

Luas lapangan yg ditumbuhi rumput = Luas persegi - Luas lingkaran

                = (6x6) - (3,14x2x2)

                = 36 - 12,56

                = 23,44 m2

Demikian semoga jelas


Drs. Sudarsono, M.Ed

14 Maret 2009
ade soraya makassar
IPA Kelas 9

bapak / ibu yg baik hati saya mau bertanya,apa pengaruh bagi kesehatan jika ditemukan protein dlm urine

Buat adik soraya, Protein memiliki berat molekul yang besar sehingga pada keadaan ginjal normal tidak akan terfiltrasi (tersaring ) di bagian glomerolus. Adanya protein dalam urin menunjukkan bahwa adanya kebocoran pada bagian glomerolus di ginjal, sehingga zat zat sisa yang harusnya disaring untuk dibuang karena ada kebocoran pada glomerolus akan tidak dapat disaring dan dibuang tetapi beredar kedalam darah lagi, hal inilah yang membahayakan kesehatan.
RR.RETNO YOSIANI T SARI, S.Pd.


14 Maret 2009
Matematika Kelas 9

Tolong bantu jwb ya.. 1. Catering Mawar mempunyai persediaan makanan utk 100 orang selama 25 hari. Catering mendapatkan tambahan 25 org.Waktu utk menghabiskan makanan adalah.. 2. Sudut x dan y berpelurus. Nilai x sama dengan 4 kali penyiku sudut y. Nilai x adalah... 3. Lingkaran berdiameter 20 cm berpusat di titik A, Garis KL menyinggung lingkaran di titik L. Panjang Kl =24 cm. Panjang KA adalah... 3. Kerangka balok yg berukuran panjang 30 cm, lebar 10cm, tinggi 9 cm dibuat dari kawat. Panjang kawat yg dipelukan adalah.. 4. Karton berukuran 440cm * 75cm dibuat tabung tanpa tutup dan alas. apabila diameter tabung 42 cm ,tinggi 10 cm, dpt dibuat tabung paling banyak... 5. Jika x= 1/y maka bentuk sederhana dari [y+ 1/y][x- 1/x] adalah... 6. Sebutkan Jumlah dua suku berikutnya dari barisan bilangan 192, 48, 12, 3, ... , ... 7. Rata-Rata penghasilan 15 orang pegawai perusahaan A adalah Rp 750.000. Rata-rata gaji pegawai pria Rp 760.000 sedang rata-rata pegawaiw anita Rp 710.000. Perbandingan jumlah pegawai pria dan wanita adalah...

1. Soal tentang perbandingan berbalik nilai.

    100 org selama 25 hr, maka :

     125 org selama (100/125)x25 hr = 20 hari.

    Jadi makanan akan habis selama 20 hari.

2.  x + y = 180 .... (1)

     x = 4(90 - y)

     x = 360 - 4y

   x + 4y = 360 ..... (2)

Eliminasi (2) dan (1) diperoleh

   x + 4y = 360

   x +  y  = 180   -

         3y = 180

          y = 180/3 = 60

  X + y = 180, maka  x = 180 - 60 = 120

   MAka nilai  x  = 120o

3. Jika digambar merupakan segitiga siku-siku di L. Menurut Pythagoras,

   KA2  = KL2 + AL2 , dimana AL = jari-jari = 10 cm

 KA2 = 242 + 102

  KA2 = 576 + 100

  KA2 = 676

   KA = 26

4. Panjang kawat yang diperlukan = 4(p+l+t)

        = 4(30+10+9)

        = 4 x 49

        = 196 cm

5. Luas karton = 440 x 75 = 33.000 cm2

    Luas tabung = ((22/7)x21x21 + (22/7)x21x10

                       = 1386 + 660 =2046

   Banyaknya tabung yg dapat dibuat = 33.000:2046

                                                     = 16 buah

 

6.  Jika x = 1/y, maka   [y+ 1/y][x- 1/x] = [y+ 1/y][1/y-y]

     = 1 - y2 + 1/y2 - 1

     = 1/y2 - y2

 atau = (1/y + y)(1/y - y)

7. Barisan 192,48,12,3 suku berikutnya adalah suku sebelumya dibagi 4, jadi dua suku berikutnya adalah 3/4 dan 3/16.

8. Misalkan jumlah pegawai pria = p, maka pegawai wanita = 15 -p

Jumlah penghasilan pegawai = 15 x 750000

Jumlah penghasilan peg. pria = 760000p

Jumlah penghasilan peg. wanita = (15-p)x710000

                                              = 15x710000 - 710000p

sehingga 760000p + 15x710000 - 710000p = 15x750000

                76p - 71p = 15x75 - 15x71

                           5p = 15x(75-71)

                           5p = 60

                             p = 12, jml. peg. pria = 12 org.

     Jumlah peg. wanita = 15 - 12 = 3 org.

Jadi perbandingan jml. peg pria dan wanita = 12:3 = 4:1

Demikian semoga jelas.

 

 


Drs. Sudarsono, M.Ed

14 Maret 2009
Arlita
IPA Kelas 9

1. Pak/bu minta tolong sebutin sel-sel hewan dan tumbuhan beserta fungsinya.. 2. Apakah yg disebut Sunspot, Prominensa,Granula? 3. bagaimana urutan perkembangan pembentukan janin dalam rahim setelah dibuahi ? Tolong jwb ya..

sel hewan dengan sel tumbuhan pada dasarnya sama yaitu memiliki membran, plasma dan inti sel. ada beberapa bagian yang membedakan  pada sel tumbuhan terdapat clorofil dan dinding sel dengan vacuola yang besar. Sel hewan memiliki vacuole kecil dan memili sentriol.

Sun spot, merupakan bintik  hitam pada matahari

Prominense, merupakan awan hidrogen yang terlempar melampai kromosfer ke korona.

Perkembangan janin setelah dibuahi (zigot) akan membelah kemudian menempel didinding rahim, pada tiga minggu pertama sudah terbentuk tulang belakang, proses berlangsung terus pada bulan ketiga jantung mulai berdenyut dan sudah ada gerakan halus, pada bulan keenam posisi kepala biasanya sudah ada dibawah dan anggota tubuh semakin lengkap  proses selanjutnya terjadi  pendewasaan pada setiap organ sehingga pada usia kandungan sembilan bulan sepuluh hari siapuntuk dilahirkan.


RR.RETNO YOSIANI T SARI, S.Pd.

13 Maret 2009
Matematika Kelas 9

Sekarang umur endang dua tahun lebih muda dari umur tika . Tiga tahun yang akan datag perbadingan umur mereka 5 : 6. berapakah jumlah umur mereka sekarang ?

Misalkan umur Endang sekarang = E, maka umur Tika = E + 2

Tiga tahun akan datang umur Endang = E + 3, maka

Umur Tika tiga tahun akan datang = E + 2 + 3

                                                 = E + 5

Perbandingan umur Endang dan Tika adalah

         (E + 3) : (E + 5) = 5 : 6

                    6(E + 3) = 5(E + 5)

                     6E + 18 = 5E + 25

                      6E - 5E = 25 - 18

                              E = 7

     Umur Endang sekarang = 7 tahun,    dan

     umur Tika sekarang = 7 + 2 = 9 tahun

Demikian semoga jelas.

 


Drs. Sudarsono, M.Ed

 

Ajukan Pertanyaan