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№578(4) Упростите данные выражения a^2-4/x^2-9 : a^2-2a/xy+3y + 2-y/x-3 Помогите пожалуйста!

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nafanya2014

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$\frac{a^2-4}{x^2-9} : \frac{a^2-2a}{xy+3y} + \frac{2-y}{x-3}= \frac{a^2-4}{x^2-9} \cdot \frac{xy+3y}{a^2-2a} + \frac{2-y}{x-3}= \\ \\ = \frac{(a-2)(a+2)}{(x-3)(x+3)} \cdot \frac{y(x+3)}{a(a-2)} + \frac{2-y}{x-3}= \\ \\ = \frac{a+2}{x-3} \cdot \frac{y}{a} + \frac{(2-y)a}{(x-3)a}= \frac{ay+2y+2a-ya}{(x-3)a}= \frac{2(y+a)}{(x-3)a}$

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NLND August 2022 | 0 Ответы

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Write the plural forms of the nouns: a. a wolf - two wolves b. a leaf - c. a kni...

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