(a+bc^2)^2-6a^2b^3(1/3a^-1b^-2c^2+1/6a^-2b^-1c^4),a=7

问题描述:

(a+bc^2)^2-6a^2b^3(1/3a^-1b^-2c^2+1/6a^-2b^-1c^4),a=7