（3m^3-2m^2+m）-(4m^3-2m^2+3m),其中m=-1; 求答案_数学解答

（3m^3-2m^2+m）-(4m^3-2m^2+3m),其中m=-1; 求答案

人气：140 ℃　时间：2020-02-05 09:57:47

解答

3m^3-2m^2+m）-(4m^3-2m^2+3m),
=3m^3-2m^2+m-4m^3+2m^2-3m
=-m^3-2m
=-(-1)^3-2*(-1)
=1+2
=3