X²-1分之X²-2X除以（X+1分之2X-1减X+1）当X等于2时,求值
问题描述：
X²-1分之X²-2X除以（X+1分之2X-1减X+1）当X等于2时,求值
答
(x^2-2x)/(x^2-1)÷[(2x-1)/(x+1)-x+1]=(x^2-2x)/(x^2-1)÷[(2x-1)/(x+1)-(x-1)(x+1)/(x+1)]=(x^2-2x)/(x^2-1)÷[(2x-1)/(x+1)-(x^2-1)/(x+1)]=(x^2-2x)/(x^2-1)÷[(2x-1-x^2+1)/(x+1)]=(x^2-2x)/(x^2-1)÷[(2x-x^2)...