计算x+2+x-2分之4
问题描述:
计算x+2+x-2分之4
答
x+2+4/(x-2)
=(x+2)(x-2)/(x-2)+4/(x-2)
=(x²-4)/(x-2)+4/(x-2)
=(x²-4+4)/(x-2)
=x²/(x-2)