若1/M—1/N=3,求(2M—3MN—2N)/(M—2MN—N)的值
4个回答
1/m-1/n=3
(2m-3mn-2n)/(m-2mn-n)
上下同除以mn
=(2/n-3-2/m)/(1/n-2-1/m)
=[2*(-3)-3)/(-3-2)
=9/5
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