
已知1/a-1/b=-4,则分式a-2ab-b/2a-2b+7ab的值为
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1/a-1/b=-4
(b-a)/ab=-4
a-b=4ab
a-2ab-b/2a-2b+7ab
=(a-b)-2ab/2(a-b)+7ab
=(4ab-2ab)/(8ab+7ab)
=2ab/15ab
=2/15
(b-a)/ab=-4
a-b=4ab
a-2ab-b/2a-2b+7ab
=(a-b)-2ab/2(a-b)+7ab
=(4ab-2ab)/(8ab+7ab)
=2ab/15ab
=2/15
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