先化简,再求值:(4a+3a^2-3+3a^3)-(-a+3a^2),其中a=-2

问题描述:

先化简,再求值:(4a+3a^2-3+3a^3)-(-a+3a^2),其中a=-2

(4a+3a^2-3+3a^3)-(-a+3a^2)
=3a^3+3a^2+4a-3+a-3a^2
=3a^3+5a-3
=3x(-2)^3-5x2-3
=-24-10-3
=-37