已知m-n=2,mn=1,求多项式(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值
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已知m-n=2,mn=1,求多项式(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值
已知m-n=2,mn=1,求多项式(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值
已知m-n=2,mn=1,求多项式(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值
(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)
=-2mn+2m+3n -3mn -2n+2m - m-4n-mn
=-6mn+3m-3n
=-6mn+3(m-n)
=-6+6=0
-6mn+3(m-n)=-6+6=0
(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)
=-2mn+2m+3n -3mn -2n+2m - m-4n-mn
=-6mn+3m-3n
=-6mn+3(m-n)
=-6+6=0
已知m-n=2,mn=1,求多项式(-2mn+2mn+3n)-(3mn+2n-2m)-(m+4n+mn)的值
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