已知m+n=3,mn= -2 求多项式2(mn+m)-[-(3n-mn)-m]+mn的值 急 请说出m n 各代表的数!
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已知m+n=3,mn= -2 求多项式2(mn+m)-[-(3n-mn)-m]+mn的值 急 请说出m n 各代表的数!
![已知m+n=3,mn= -2 求多项式2(mn+m)-[-(3n-mn)-m]+mn的值 急 请说出m n 各代表的数!](/uploads/image/z/8783179-43-9.jpg?t=%E5%B7%B2%E7%9F%A5m%2Bn%3D3%2Cmn%3D+-2+%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+%E6%80%A5+%E8%AF%B7%E8%AF%B4%E5%87%BAm+n+%E5%90%84%E4%BB%A3%E8%A1%A8%E7%9A%84%E6%95%B0%21)
2(mn+m)-[-(3n-mn)-m]+mn
=2mn+2m+3n-mn+m+mn
=2mn+3m+3n
=2mn+3(m+n)
=2×(-2)+3×3
=5
=2mn+2m+3n-mn+m+mn
=2mn+3m+3n
=2mn+3(m+n)
=2×(-2)+3×3
=5
已知m+n=3,mn= -2 求多项式2(mn+m)-[-(3n-mn)-m]+mn的值 急 请说出m n 各代表的数!
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