1/(a2-2a+1)-1/(a2+a-2)的计算结果

问题描述:

1/(a2-2a+1)-1/(a2+a-2)的计算结果

1/(a²-2a+1)-1/(a²+a-2)
=1/(a-1)²-1/[(a+2)(a-1)]
=[(a+2)-(a-1)]/[(a-1)²(a+2)]
=3/[(a-1)²(a+2)]