若1/m-1/n=3,求(2m-3mn-2n)/(m-2mn-n)的值.
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若1/m-1/n=3,求(2m-3mn-2n)/(m-2mn-n)的值.
若1/m-1/n=3,求(2m-3mn-2n)/(m-2mn-n)的值.
若1/m-1/n=3,求(2m-3mn-2n)/(m-2mn-n)的值.
1/m-1/n=(n-m)/nm=3
(2m-3mn-2n)/(m-2mn-n)=(2m-2n-3mn)/(m-n-2mn)=(-6mn-3mn)/(-3mn-2mn)=9/5
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