x^2 = y^2 不一定代表說 x = y, 也可能 x = -y, x = 1 是 x = -(x - 2) 的解
_________________ This statement is false.
Conclusion: "This statement is false" is not a statement.
2007-07-12 12:19
2266 Not too shy to talk
註冊日: 2007-05-17 發表數: 23
Re: 幫我檢查哪裡錯了?
方程式兩邊一起平方 會產生增根 所以第一步驟不可以
2007-07-12 18:53
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