Question

$\frac{5a + 5b}{b} \times \frac{6b {}^{2} }{a {}^{2} - b {}^{2} }$
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Answer 1

Ответ:

$\frac{30b}{a-b}$

Объяснение:

$\frac{5a+5b}{b}*\frac{6b^2}{a^2-b^2}=\\\\\frac{5(a+b)}{b}*\frac{6b^2}{(a-b)(a+b)}=\\\\\frac{5(a+b)*6b^2}{b*(a-b)(a+b)}=\\\\\frac{5*6b^2}{b*(a-b)}=\frac{5*6b}{(a-b)}=\frac{30b}{a-b}$