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解法: 特殊路径法:求二重极限,分子次数和分母次数相等,99%极限不存在。(此方法只可用于证明极限不存在,不能证明极限存在)
二重极限: 一元方法、夹逼、无穷小×有界量
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如果函数
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可微
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一、高阶偏导数
若函数
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定理 若函数
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设
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如果
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同路相乘,异路相加。(相当于一阶的链式求导)
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设函数
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参考导数的运算法则
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可疑极值点:偏导为0的点。(或偏导不存在的点,考试不会这么难)
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求解目标函数
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拉格朗日乘数法步骤:
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设函数
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注:
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内部:无条件极值;边界:条件极值;
设空间曲线
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设曲面
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