设m和n均不为0,3x^2y^m+n和-5x^m y^3是同类项,求3m^3-m^2n+3m的值如题
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![设m和n均不为0,3x^2y^m+n和-5x^m y^3是同类项,求3m^3-m^2n+3m的值如题](/uploads/image/z/2601650-2-0.jpg?t=%E8%AE%BEm%E5%92%8Cn%E5%9D%87%E4%B8%8D%E4%B8%BA0%2C3x%5E2y%5Em%2Bn%E5%92%8C-5x%5Em+y%5E3%E6%98%AF%E5%90%8C%E7%B1%BB%E9%A1%B9%2C%E6%B1%823m%5E3-m%5E2n%2B3m%E7%9A%84%E5%80%BC%E5%A6%82%E9%A2%98)
设m和n均不为0,3x^2y^m+n和-5x^m y^3是同类项,求3m^3-m^2n+3m的值如题
设m和n均不为0,3x^2y^m+n和-5x^m y^3是同类项,求3m^3-m^2n+3m的值
如题
设m和n均不为0,3x^2y^m+n和-5x^m y^3是同类项,求3m^3-m^2n+3m的值如题
是同类项则x和y的次数相等
所以2=m
m+n=3
m=2,n=3-m=1
所以3m^3-m^2n+3m
=3×8-4×1+3×2
=26