已知a-b-3ab=0,求分式(2a 3ab-2b)/(a-ab-b)RT
问题描述:
已知a-b-3ab=0,求分式(2a 3ab-2b)/(a-ab-b)
RT
答
a-b-3ab=0
a-b=3ab
(2a +3ab-2b)/(a-ab-b)
=[2(a-b)+3ab]/(a-b-ab)
=9ab/2ab
=9/2