作业帮已知m+n=3,mn=-2,求多项式2(mn+m)-[-(3n-mn)-m]+mn的值（先化简,再求值）
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![已知m+n=3,mn=-2,求多项式2(mn+m)-[-(3n-mn)-m]+mn的值（先化简,再求值）](/uploads/image/z/2574562-58-2.jpg?t=%E5%B7%B2%E7%9F%A5m%2Bn%3D3%2Cmn%3D-2%2C%E6%B1%82%E5%A4%9A%E9%A1%B9%E5%BC%8F2%28mn%2Bm%29-%5B-%283n-mn%29-m%5D%2Bmn%E7%9A%84%E5%80%BC%EF%BC%88%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%EF%BC%89)
已知m+n=3,mn=-2,求多项式2(mn+m)-[-(3n-mn)-m]+mn的值（先化简,再求值）
已知m+n=3,mn=-2,求多项式2(mn+m)-[-(3n-mn)-m]+mn的值（先化简,再求值）
已知m+n=3,mn=-2,求多项式2(mn+m)-[-(3n-mn)-m]+mn的值（先化简,再求值）
2(mn+m)-[-(3n-mn)-m]+mn
=2mn+2m+3n-mn+m+mn
=2mn+3m+2n
=2mn+3(m+n)
∵m+n=3,mn=-2
∴2(mn+m)-[-(3n-mn)-m]+mn
=2mn+3(m+n)
=2×(-2)+3×3
=-4+9
=5
原式=2mn+2m+3n-mn+m+mn
=2mn+3(m+n)
=2*(-2)+3*3
=9-4
=5
2(mn + m) - [ -(3n - mn) - m] + mn
= 2mn + 2m + 3n - mn + m + mn
= 2mn + 3m + 3n
= 2mn + 3(m + n)
= 2×(-2) + 3×3
= -4 + 9
= 5
2(mn+m)-[-(3n-mn)-m]+mn=2mn+2m+3n-mn+m+mn=2mn+3m+3n=-4+9=-5
2mn+2m-(-3n+mn-m)+mn=2mn+3m+3n=2*2+3*(m+n)=4+3*(-2)=-2
2(mn+m)-[-(3n-mn)-m]+mn
=2(mn+m)-(-3n+mn-m)+mn
=2mn+2m+3n-mn+m+mn
=2mn+3m+3n
=2mn+3(m+n)=5
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