(a b c)3怎么算
问题描述：
(a b c)3怎么算
答
(a+ b+ c)^3=(a+b+c)(a+b+c)^2=(a+b+c)(a^2+2ab+b^2+2bc+c^2+2ac)=(a^3+2a^2b+ab^2+2abc+ac^2+2a^2c)+(a^2b+2ab^2+b^3+2b^2c+bc^2+2abc)+(a^2c+2abc+b^2c+2bc^2+c^3+2ac^2)=a^3+b^3+c^3+3a^2b+3ab^2+3a^2c+3ac^2+3b^...