Предмет: Алгебра, автор: djessika5

укажите множество решений неравенства :в числителе (х-8) в знаменателе (х-1)(х+4) ≤0 прошу как можно побыстрее и понятно

Ответы

Автор ответа: MrMagnet

Это уравнения можно записать в следующем виде:

(x-8)(x-1)(x+4)≤0

Но мы должны учитывать что x-1≠0 и x+4≠0

То есть x≠1 и x≠-4

Теперь чертим координатную прямую, отмечаем на ней точки -4, 1, 8 и смотрим в каких интервалах наше уравнение меньше нуля.

Получаем ответ: (-4; 1)U[8; +∞)

Ой прости я невнимательно прочел задание и просто решил неравенство

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DEVELOPMENT OF TELECOMMUNICATIONS
Early telecommunications included smoke signals and drums. In 1792, a French engineer,
Claude Chappe built the first visual telegraphy (or semaphore) system between Lille and Paris.
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1. Read and translate the text. Answer the following questions.

1. What did early telecommunications include?

2. Who built the first semaphore system?

3. What did semaphore as a communication system suffer from?

4. When was the first commercial electric telegraph constructed?

5. It used the deflection of needles to represent messages, didn't it?

6. What did Samuel Morse do on the other side of the Atlantic Ocean?

7. What happened on 27 July 1866?

8. Has the international use of the telegraph sometimes been dubbed the "Victorian Internet”?

9. What do you know about the first commercial telephone services?

10. What did Guglielmo Marconi do in December 1901?

2. Translate the following equivalents from the text and memorize them.

Smoke signals, visual telegraphy, skilled operators, to represent messages, the patented invention, transatlantic communication, to establish wireless communication, to investigate packet switching, to become widespread, orbiting satellites.

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b) electrical telegraph;

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a) In December, 1901;

b) On March, 1925;

c) On April, 1839.

3. The spread of ..... allowed television networks to spread across large countries.

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b) commercial telephone services;

c) coaxial cable and microwave radio relay.

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