a-2ab-b分之2a+3ab-2b
=(2/b+3-2/a)/(1/b-2-1/a) 分子分母同时除以ab
=[-2(1/a-1/b)+3]/[-(1/a-1/b)-2]
=-3/(-3-2)
=3/5
已知a分之1-b分之1=3,求a-2ab-b分之2a+3ab-2b的值
已知a分之1-b分之1=3,求a-2ab-b分之2a+3ab-2b的值
数学人气：634 ℃时间：2020-05-02 20:38:04
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