若a+b=4ab 则代数式2a-ab+2b/2ab值为?

问题描述:

若a+b=4ab 则代数式2a-ab+2b/2ab值为?

2a-ab+2b/2ab
=[2(a+b)-ab]/2ab
=(2*4ab-ab)/2ab
=7ab/2ab
=7/2