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已知m-n=3,mn=-1,求多项式-2mn+2m+3n-3mn-2n+2m-4n-m-mn的值
人气：441 ℃　时间：2019-10-17 06:08:40
解答
-2mn+2m+3n-3mn-2n+2m-4n-m-mn
=-6mn+3m-3n
=-6mn+3(m-n)
=6+9
=15
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