(1/2a^3b-a^2+2/3b^2)-2(1/8a^2+1/3a^3b-1/5b^2)计算

问题描述:

(1/2a^3b-a^2+2/3b^2)-2(1/8a^2+1/3a^3b-1/5b^2)计算

原式=1/2a^3b-a^2+2/3b^2-1/4a^2-2/3a^3b+2/5b^2
=-1/6a^3b-5/4a^2+16/15b^2