计算(2x^3-8x)/(x^2+2x)

问题描述:

计算(2x^3-8x)/(x^2+2x)

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