3(a^3-a^2b+1 ab^2)+1 (a^3+4a^2b+3ab^2)=?
问题描述：
3(a^3-a^2b+1 ab^2)+1 (a^3+4a^2b+3ab^2)=?
打错了是这道题3(a^3-a^2b+1 ab^2)+1\2 (a^3+4a^2b+3ab^2)=?
答
3(a^3-a^2b+1 ab^2)+1/2 (a^3+4a^2b+3ab^2)
=3a^3-3a^2b+3ab^2+1/2a^3+2a^2b+3/2ab^2
=3.5a^3-a^2b+4.5ab^2
=a(3.5a^2-ab+4.5b^2)