∵ 1/a-1/b=3
∴ b-a=3ab
a-ab-b=a-b-ab
=-3ab-ab
=-4ab
2a+3ab-2b=2(a-b)+3ab
=2×(-3ab)+3ab
=-3ab
∴原式=-4ab/(-3ab)
= 4/3
a分之1 减 b分之1 = 3,求分式(a-ab-b)分之(2a+3ab-2b)的值.
a分之1 减 b分之1 = 3,求分式(a-ab-b)分之(2a+3ab-2b)的值.
数学人气:142 ℃时间:2020-02-21 01:14:30
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