solve 1over x-1 加 1over x+1 加 3x-1over 1-x 2次 等於2
叫你求個x,答案係 -3 over 2!!
要成條公式!!!
數學問題 求x
2007-12-03 7:20 am
回答 (1)
2007-12-03 7:59 am
✔ 最佳答案
1/ (x-1) + 1/ (x+1) + (3x-1)/(1-x^2) = 2(x+1)+(x-1) / (x+1)(x-1) + (3x-1) / (1-x^2) = 2
2x / (x^2-1) + (3x-1) / (1-x^2) = 2
2x / (x^2-1) - (3x-1) / (x^2-1) = 2
(2x-3x+1) / (x^2-1) = 2
- (x-1) / (x+1)(x-1) = 2
-1 / (x+1) = 2
-1 = 2x+2
2x = -3
x = - 3/2
2007-12-02 23:59:58 補充：
^2 係 2次方/ 係 分數線
參考: 題數比我搞到好亂咁..但係答案計到..
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