若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值兄弟们回答下吧啊。。
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![若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值兄弟们回答下吧啊。。](/uploads/image/z/1088380-28-0.jpg?t=%E8%8B%A5m-n%3D4%2Cmn%3D-1%2C%E6%B1%82%28-2mn%2B2m%2B3n%29-%283mn%2B2n-2m%29-%28m%2B4n%2Bmn%29%E7%9A%84%E5%80%BC%E5%85%84%E5%BC%9F%E4%BB%AC%E5%9B%9E%E7%AD%94%E4%B8%8B%E5%90%A7%E5%95%8A%E3%80%82%E3%80%82)
若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值兄弟们回答下吧啊。。
若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值
兄弟们回答下吧啊。。
若m-n=4,mn=-1,求(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值兄弟们回答下吧啊。。
(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)
=-2mn+2m+3n-3mn-2n+2m-m-4n-mn
=(-2mn-3mn-mn)+(2m+2m-m)+(3n-2n-4n)
=-6mn+3m-3n
=-6mn+3(m-n)
将m-n=4,mn=-1带入
=-6mn+3(m-n)
=-6×(-1)+3×4
=-6+7
=1
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