1/a-1/b=(b-a)/ab=3
b-a=3ab,a-b=-3ab
(2a+3ab-2b)/(a-ab-b)
=〔2(a-b)+3ab〕/(a-b-ab)
=(-6ab+3ab)/(-3ab-ab)
=-3ab/(-4ab)
=3/4
已知,a分之1-b分之1=3.求分式a-ab-b分之2a+3ab-2b的值
已知,a分之1-b分之1=3.求分式a-ab-b分之2a+3ab-2b的值
数学人气：992 ℃时间：2019-11-09 15:55:56
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