Предмет: Математика, автор: zhykvv

!!Решите,пожалуйста!!

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Автор ответа: Единорожек34

9)
$\frac{17+2\sqrt{30}}{\sqrt{15}+\sqrt{2}}=\frac{15+2*\sqrt{15}*\sqrt{2}+2}{\sqrt{15}+\sqrt{2}}=\frac{(\sqrt{15}+\sqrt{2})^2}{\sqrt{15}+\sqrt{2}}=\sqrt{15}+\sqrt{2}$

10)
$\frac{(x+4)^2}{x^2-9}\leqslant0\\\frac{(x+4)^2}{(x-3)(x+3)}\leqslant0$

__+_(-4)_+_(-3)__-__(3)_+__>

x∈(-3; 3)∪{-4}

Единорожек34: На интервале у -3 и 3 точки не закрашены, а у 4 закрашенная точка, иметь ввиду

Единорожек34: Точнее на прямой, а не на интервале

Единорожек34: Спасибо на добром слове) У вас, кстати, улыбка очень милая,

Единорожек34: Всем бы так)

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