若1/a-1/b=3,则分式2a+3ab-2b/a-2ab-b的值为
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若1/a-1/b=3,则分式2a+3ab-2b/a-2ab-b的值为
若1/a-1/b=3,则分式2a+3ab-2b/a-2ab-b的值为
若1/a-1/b=3,则分式2a+3ab-2b/a-2ab-b的值为
1/a-1/b=3
(b-a)/ab=3
b-a=3ab
2a+3ab-2b/a-2ab-b
=(-2(b-a)+3ab)/(-(b-a)-2ab)
=(-6ab+3ab)/(-3ab-2ab)
=-3ab/-5ab
=3/5
由1/a-1/b=3得:(b-a)/ab=3,b-a=3ab,a-b=-3ab
(2a+3ab-2b)/(a-2ab-b)
=(2a-2b+3ab)/(a-b-2ab)
=(6ab+3ab)/(-3ab-2ab)
=9ab/(-5ab)/=-9/5
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