2x方-4x立方-1除以2x+(x-1)等于多少
问题描述：
2x方-4x立方-1除以2x+(x-1)等于多少
答
={[(x+1)(x-1)-3]/(x-1)}÷[x(x²-4)/(x-1)²]
=[(x²-4)/(x-1)]×[(x-1)²/x(x²-4)]
=(x-1)/x