Предмет: Алгебра, автор: dron3696

игрек равен икс в третьей степени минус четыре икс в квадрате найти точки экстремума и промежутки возрастания и убывания

Ответы

Автор ответа: kevrat

y=x^3-4x^2

y'=3x^2-8x

3x^2-8x=0

x(3x-8)=0

x=0 x=3/8

По координатной прямой функция возрастает на промежутке 0т -беск до 0,а убываетот 0 до + беск.Точка экстремума 0-точка максимума

Автор ответа: Mikus

y=x^3-4x^2

y'=3x^2-8x

3x^2-8x=0

x(3x-8)=0

x=0 x=3/8

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Testwork.
1) Write the Russian equivalents of the following words:
1. household –
2. to compete –
3. native speaker –
4. an exception –
5. attractive –
6. over twenty –
7. patronimic –
8. step brother –
9. flute –
10. impressive –
11. clippers –
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15. matron –
16. clip –
17. teasing –
18. hairpiece –
19. curlingirons –
20. to keep records of products and services –
21. flaw –
22. medical aids –
23. to apply –

2) Put the verbs in brackets into Past Simple:
1. My family (live) in Canada three years ago.
2. They (finish) work only at nine o’clock last night.
3. He (work) for BBC company three years ago.
4. Sally (not answer) telephone calls yesterday.
5. I (have) a bicycle when I was a child.
6. She (not take) a taxi to the station last week.
7. We (eat) tasty fish at a restaurant last night.
8. They (see) dolphins in the sea this morning.
9. She (buy) a new dress for birthday party yesterday.
3) Put the verbs in brackets into Past Continuous:
1. We (watch) TV when suddenly we lost all the power.
2. While I (cook) dinner, I cut my finger.
3. The goalkeeper (not pay) attention, so the opposing team scored.
4. Mary (wait) for me when I arrived home.
5. Polly (not run) as fast as usual during the race.
6. What (do) you at this time yesterday?
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8. He (not drive) very fast when the accident happened.

4) Put the verbs in brackets into Past Perfect:
1. The house was very quiet because everybody (leave) it.
2. My family was in France last year. We (be) never there before.
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4. We rushed to the station but it was too late. The train just (leave).
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6. My wallet wasn’t in my bag as somebody (steal) it.

5) Use the words in brackets in the correct form (Future Simple or Present Simple):
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3. When he (call) I (give) him a piece of my mind.
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6. He (wait) until they (send) for him.
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8. I (write) about it when I (have) time.

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1. I (sleep) from 10 to 12 o’clock tomorrow.
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