Question

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

$\frac{9b}{a-b}*\frac{a^{2}-ab }{72b}=\frac{9b*a*(a-b)}{(a-b)*72b}=\boxed{\frac{a}{8}}\\\\a=-18\\\\\frac{a}{8}=-\frac{18}{8} =\boxed{-2,25}$

Answer 2

Ответ:

$\frac{9b}{a - b} \times \frac{a {}^{2} - ab }{72b} =$

$\frac{9b}{a - b} \times \frac{a(a - b)}{72b}$

$\frac{9b \times a(a - b)}{(a - b) \times 72b} =$

$\frac{b \times a}{8b} =$

якщо a=-18, b=4,6 то

$\frac{4.6 \times ( - 18)}{8 \times 4.6} =$

$\frac{ - 82.8}{36.8} = -2.25$