已知1/a+1/b=3,求(a-2ab+b)/(3a+2ab+3b)的值

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已知1/a+1/b=3,求(a-2ab+b)/(3a+2ab+3b)的值已知1/a+1/b=3,求(a-2ab+b)/(3a+2ab+3b)的值已知1/a+1/b=3,求(a-2ab+b)/(3a+2

已知1/a+1/b=3,求(a-2ab+b)/(3a+2ab+3b)的值
已知1/a+1/b=3,求(a-2ab+b)/(3a+2ab+3b)的值

已知1/a+1/b=3,求(a-2ab+b)/(3a+2ab+3b)的值
1/a+1/b=3
(a+b)/ab=3
a+b=3ab
(a-2ab+b)/(3a+2ab+3b)
=(3ab-2ab)/(9ab+2ab)
=1/11