计算 x²+4x+4 / x²-4 + x/ 2-x

问题描述:

计算 x²+4x+4 / x²-4 + x/ 2-x


原式
=(x+2)²/(x-2)(x+2)-x/(x-2)
=(x+2)/(x-2)-x/(x-2)
=(x+2-x)/(x-2)
=2/(x-2)