Question

先化简再求值：（2+1/a-1剪1/a+1）除以（a-a/1-a平方）,其中a=2——要过程

Answer 1

2+1/a-1剪1/a+1）除以（a-a/1-a平方）,

=(2+2/(a²-1))/(a-a/(1-a²))

=2/a

=2/2

=1;