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Apr 28th 2013, 10:35

ln |v| = ln(|x-1|/x^2), 結果必須寫 |v| = |x-1|/x^2 而不能直接
拿掉絕對值. 你所說最後答案拿掉絕對值, 可能有它不需加
絕對值的理由, 而不是任何時候都可以任意拿掉的.

例如在解微分方程時結果還有個 "任意常數", 而取 anti-log
之後換成 "任意常數倍" 可能正好可以拿掉絕對值.

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