计算:(a-1)/(a+2)•[(a²+4a+4)/(a-1)]-2
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计算:(a-1)/(a+2)•[(a²+4a+4)/(a-1)]-2
计算:(a-1)/(a+2)•[(a²+4a+4)/(a-1)]-2
计算:(a-1)/(a+2)•[(a²+4a+4)/(a-1)]-2
(a-1)/(a+2)•[(a²+4a+4)/(a-1)]-2
=(a-1)/(a+2)•[(a+2)²/(a-1)]-2
=a+2-2
=a
(a- 1)/(a+2)•[(a²+4a+4)/(a-1)]-2
=(a+2)-2
=a