(a²-1)/(a²-4)×(a²-4a+4)/(a+1)=求过程 急!
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(a²-1)/(a²-4)×(a²-4a+4)/(a+1)=求过程 急!
(a²-1)/(a²-4)×(a²-4a+4)/(a+1)=
求过程 急!
(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)