Объяснение:
(a²-1)/(1-a)=((a-1)(a+1))/(-(a-1))=-a-1
(m-n)/(n-m)²=(m-n)/(m-n)²=1/(m-n)
(x+1)²/(x²-1)=(x+1)²/((x-1)(x+1))=(x+1)/(x-1)
(a²-1)/(a-1)²=((a-1)(a+1))/(a-1)²=(a+1)/(a-1)
Объяснение:
(a²-1)/(1-a)=((a-1)(a+1))/(-(a-1))=-a-1
(m-n)/(n-m)²=(m-n)/(m-n)²=1/(m-n)
(x+1)²/(x²-1)=(x+1)²/((x-1)(x+1))=(x+1)/(x-1)
(a²-1)/(a-1)²=((a-1)(a+1))/(a-1)²=(a+1)/(a-1)