关于x,y得多项式(5m+1)x^2y+(4n-2)xy^2-3x+y-(-2m-6)x^2y+(3-3n)xy^2 不含三次项,求5m+2n的值
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![关于x,y得多项式(5m+1)x^2y+(4n-2)xy^2-3x+y-(-2m-6)x^2y+(3-3n)xy^2 不含三次项,求5m+2n的值](/uploads/image/z/1987340-68-0.jpg?t=%E5%85%B3%E4%BA%8Ex%2Cy%E5%BE%97%E5%A4%9A%E9%A1%B9%E5%BC%8F%EF%BC%885m%2B1%29x%5E2y%2B%284n-2%29xy%5E2-3x%2By-%28-2m-6%29x%5E2y%2B%283-3n%29xy%5E2+%E4%B8%8D%E5%90%AB%E4%B8%89%E6%AC%A1%E9%A1%B9%2C%E6%B1%825m%2B2n%E7%9A%84%E5%80%BC)
关于x,y得多项式(5m+1)x^2y+(4n-2)xy^2-3x+y-(-2m-6)x^2y+(3-3n)xy^2 不含三次项,求5m+2n的值
关于x,y得多项式(5m+1)x^2y+(4n-2)xy^2-3x+y-(-2m-6)x^2y+(3-3n)xy^2 不含三次项,求5m+2n的值
关于x,y得多项式(5m+1)x^2y+(4n-2)xy^2-3x+y-(-2m-6)x^2y+(3-3n)xy^2 不含三次项,求5m+2n的值
(5m+1)x^2y+(4n-2)xy^2-3x+y-(-2m-6)x^2y+(3-3n)xy^2
=(7m+7)x^2y+(n+1)xy^2-3x+y
不含三次项
7m+7=0,n+1=0
m=-1,n=-1
5m+2n=-5-2=-7