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注意,以下判斷都是建立在原函數以及其任意階導數都是連續函數的基礎上的.\x0d二階導數的作用是根據其正負,判斷一階導數的單調性(二階導數大於零,那麼一階導數單調遞增;二階導數小於零,那麼一階導數單調遞減),然後…
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