已 知m-n=4,mn=-1,求：（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值
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已知m-n=4,mn=-1,求：（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值已知m-n=4,mn=-1,求：（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+m
已 知m-n=4,mn=-1,求：（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值
已 知m-n=4,mn=-1,求：（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值
已 知m-n=4,mn=-1,求：（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值
已 知m-n=4,mn=-1,求：（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值
：（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)=-2mn+2m+3n-3mn-m-4n-mn
=-6mn+m-n=6+4=10
=2+2m+3n+3-m-4n+1
=6+m-n
=10
已 知m-n=4,mn=-1,求：（-2mn+2m+3n)-(3mn+2n-2n)-(m+4n+mn)的值
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