Question

2/1-a+1/(a-1)²

初中分式计算

Answer 1

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

Answer 2

=1/(a-1)²-2/a-1 = 1/(a-1)²-2(a-1)/(a-1)² = 1-2(a-1) /(a-1)² = 3-2a/(a-1)²

应该是这样的。如果有问题，可以告诉我。