若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值.
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問題詳情:
若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值.
【回答】
(3)(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)=-2mn+2m+3n-3mn-2n+2m-m-4n-mn
=-6mn+3(m-n).
當m-n=4,mn=-1時,原式=-6×(-1)+3×4=18.
知識點:整式的加減
題型:解答題
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