(x^3+8)/(x+2)是怎么化简成 x^2-2x+4的?

问题描述:

(x^3+8)/(x+2)是怎么化简成 x^2-2x+4的?

(x^3+8)/(x+2)
=(x^3+2^3)/(x+2)
=(x+2)(x^2-2x+4)/(x+2)
=x^2-2x+4