(1-a+1分之1)除以a+1分之a平方-a 化简

问题描述:

(1-a+1分之1)除以a+1分之a平方-a 化简

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