-2x(3x-7y)+(x-y)(x^2+xy+y^2) 计算

问题描述:

-2x(3x-7y)+(x-y)(x^2+xy+y^2) 计算

-2x(3x-7y)+(x-y)(x^2+xy+y^2)=X^3+Y^3-6X^2+14XY