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比如說,對於函數f(x)的導數f'(x),如果f'(x)在某一定義域內恒大於或等於零(且不恒為零),則f(x)在此定義域內單調遞增;如果f'(x)在某一定義域內恒小於或等於零(且不恒為零),則f(x)在此定義域內單調遞減.
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