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