數學問題~5分~~

你條式列得好亂……
應該係咁拆：
.x........2........ - 4
___—____＝_____
x+1....x-1.....x(x-1)

x(x-1)2(x+1)........-4
___________＝_____
..x^2-1^2..........x(x-1)

...........................-4
................2x＝______
........................x(x-1)

...........................2x
..................-4＝______
.........................x(x-1)

-4＝2÷(x-1)
x-1=2÷-4
x=-2+1
x=-1
備註：
1.X^Y =X的Y次方
2. 分數間的.....為就位之用，不必抄下

x / (x+1) - 2/(x-1) = -4 / (x^2 - 1)

x(x-1) - 2(x+1) 　　　 - 4
-------------------- = --------------
(x-1) * (x+1)　　　x^2 - 1

x^2 - x - 2x - 2　　　-4
-------------------- = -----------------
x^2 - 1　　　　　 x^2 - 1

x^2 - 3x - 2 + 4 = 0
x^2 - 3x + 2 = 0
(x-1)*(x-2) = 0

x = 1 or 2


我希望我冇睇錯條題目* =)