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
答
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)]