若m-n=2,mn=1,则多项式(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值是______.
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若m-n=2,mn=1,则多项式(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值是______.
原式=-2mn+2m+3n-3mn-2n+2m-m-4n-mn
=3(m-n)-6mn
=3×2-6×1
=0.
=3(m-n)-6mn
=3×2-6×1
=0.
若m-n=2,mn=1,则多项式(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)的值是______.
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