Question

Упростите выражение пожалуйста

Answer 1

6/(a-1)-10/(a-1)^2*(a^2-1)/10-2(a+1)/(a-1)=6/(a-1)-(a+1)/(a-1)-2(a+1)/(a-1)=

(6-a-1-2a-2)/(a-1)=(3-3a)/(a-1)=-3

Answer 2

$frac{6}{a-1}-frac{10}{(a-1)^2}:frac{10}{a^2-1}-frac{2a+2}{a-1}=frac{6}{a-1}-frac{2a+2}{a-1}-frac{10}{(a-1)^2}:frac{10}{a^2-1}=\=frac{6-2a-2}{a-1}-frac{10}{(a-1)^2}*frac{a^2-1}{10}=frac{4-2a}{a-1}-frac{a+1}{a-1}=frac{4-2a-a-1}{a-1}=frac{3-3a}{a-1}=\=frac{-3(a-1)}{a-1}=-3$