(a²-1)/(a²-4)×(a²-4a+4)/(a+1)=

问题描述:

(a²-1)/(a²-4)×(a²-4a+4)/(a+1)=
求过程 急!

(a²-1)/(a²-4)×(a²-4a+4)/(a+1)
=(a-1)(a+1)/(a-2)(a+2)x(a-2)^2/(a+1)
=(a-1)(a-2)/(a+2)我算的a²-3a+2/a+2对吗对啊