Question

Решение,80 баллов
8 класс,оч надо

Answer 1

$\frac{7}{a-2}* \frac{5}{5}= \frac{7*5}{5*(a-2)}= \frac{35}{5a-10}$
$\frac{7}{a-2}* \frac{-3}{-3}= \frac{7*(-3)}{(-3)*(a-2)}= \frac{-21}{6-3a}$
$\frac{7}{a-2}* \frac{a}{a}= \frac{7*a}{a*(a-2)}= \frac{7a}{a^{2}-2a}$
$\frac{7}{a-2}* \frac{a+2}{a+2}= \frac{7*(a+2)}{(a+2)*(a-2)}= \frac{7a+14}{a^{2}-4}$
Если есть вопросы - задавайте

Answer 2

7/(a-2)=35/5(a-2) =35/(5a-10)    
7/(а-2)=-21/(-3(a-2))=21/(6-3a)
7/(a-2)=7a/a(a-2)=7a/(a²-2a)
7/(a-2)=7(a+2)/(a-2)(a+2)=(7a+14)/(a²-4)