已知-3a^2m b^4与5分之1a^6 b^n-2是同类项,求代数式-3m^2n+2mn^2-5mn+4m^2n-3n^2m+5_数学解答

已知-3a^2m b^4与5分之1a^6 b^n-2是同类项,求代数式-3m^2n+2mn^2-5mn+4m^2n-3n^2m+5mn-1的值大侠
同上

人气：235 ℃　时间：2020-08-03 03:16:56

解答

是同类项
所以2m=6
4=n-2
所以m=3,n=6
-3m^2n+2mn^2-5mn+4m^2n-3n^2m+5mn-1
=m^2n-mn^2-1
=54-108-1
=-55