a-b=2ab,求分式2a+ab+2b/a-3ab+b的值

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a-b=2ab,求分式2a+ab+2b/a-3ab+b的值a-b=2ab,求分式2a+ab+2b/a-3ab+b的值a-b=2ab,求分式2a+ab+2b/a-3ab+b的值a-b=2abab=(a-

a-b=2ab,求分式2a+ab+2b/a-3ab+b的值
a-b=2ab,求分式2a+ab+2b/a-3ab+b的值

a-b=2ab,求分式2a+ab+2b/a-3ab+b的值
a-b=2ab
ab=(a-b)/2
分式2a+ab+2b/a-3ab+b
=(2a+(a-b)/2+2b)/(a-3(a-b)/2+b)
=1/2(4a+a-b+4b)/(1/2(2a-3(a-b)+2b))
=(5a+3b)/(-a+5b)

题应该是a+b=2ab吧!
(2a+ab+2b)/(a-3ab+b)
=(2a+2b+ab)/(a+b-ab)
=(4ab+ab)/(2ab-ab)
=5ab/-ab
=-5

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