Предмет: Математика, автор: babasik200713

Полное решение пожалуйста​

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Ответы

Автор ответа: sabirzelena
0

Ответ:

Пошаговое объяснение:

а)

(х+3)(х-5)(х-7)<0

Корни:

х=-3; х=5;х=7.

Применяем метод интервалов.

-------(-3)+++++++++(5)------(7)++++++++

х∈(-∞;-3)∪(5;7).

б)

(х-3)/(х+2)>0

х=3

х=-2 точка пустая.

Метод интервалов.

++++++(-2)----------(3)+++++++

х∈(-∞;-2)∪(3;+∞)

в)

(х-1)(х+4)/(3-х)≤0

Корни:

х=1 ;х=-4; х=3 точка пустая.

+++++++[-4]----------[1]++++++++(3)--------

х∈[-4;1]∪(3;+∞)

г)

х²(5х-4)(х+7)<0

Корни:

х=0 точка пустая

х=4/5

х=-7

Метод интервалов:

+++++++(-7)-------------(0)-----------(4/5)+++++++

х∈(-7;  0)∪(0; 4/5)

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