6(m^4+n^3)-(2m^2-5)-3(2m^4+3n^3)+(-2m^2+1)其中m=1/2,n=-2

问题描述:

6(m^4+n^3)-(2m^2-5)-3(2m^4+3n^3)+(-2m^2+1)其中m=1/2,n=-2

原式=6m^4+6n^3-2m^2+5-6m^4-9n^3-2m^2+1
=-3n^3-4m^2+6
=24-1+6
=29