当多项式-5x的三次方-2mx的3次方+x的2次方+2x-3nx-1(m,n为常数项)不含二次项和一此项时,求m+n的值.
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![当多项式-5x的三次方-2mx的3次方+x的2次方+2x-3nx-1(m,n为常数项)不含二次项和一此项时,求m+n的值.](/uploads/image/z/2521209-57-9.jpg?t=%E5%BD%93%E5%A4%9A%E9%A1%B9%E5%BC%8F-5x%E7%9A%84%E4%B8%89%E6%AC%A1%E6%96%B9-2mx%E7%9A%843%E6%AC%A1%E6%96%B9%2Bx%E7%9A%842%E6%AC%A1%E6%96%B9%2B2x-3nx-1%28m%2Cn%E4%B8%BA%E5%B8%B8%E6%95%B0%E9%A1%B9%EF%BC%89%E4%B8%8D%E5%90%AB%E4%BA%8C%E6%AC%A1%E9%A1%B9%E5%92%8C%E4%B8%80%E6%AD%A4%E9%A1%B9%E6%97%B6%2C%E6%B1%82m%2Bn%E7%9A%84%E5%80%BC.)
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