Предмет: Алгебра, автор: inanastya

Сократить дробь b^2+9b/b^2-81=

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Автор ответа: Rechnung

$\frac{b^2+9b}{b^2-81}= \frac{b(b+9)}{(b-9)(b+9)}= \frac{b}{b-9}$

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