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Th4: (取极值的第二充分条件)设$f(x)$在点${{x}{0}}$处有$f''(x)\ne 0$，且$f,'({{x}{0}})=0$，则 当$f','({{x}{0}})<0$时，$f({{x}{0}})$为极大值； 当$f','({{x}{0}})>0$时，$f({{x}{0}})$为极小值。 注：如果$f','({{x}{0}})**<**0$，此方法失效。
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Th4: (取极值的第二充分条件)设$f(x)$在点${{x}{0}}$处有$f''(x)\ne 0$，且$f,'({{x}{0}})=0$，则 当$f','({{x}{0}})<0$时，$f({{x}{0}})$为极大值； 当$f','({{x}{0}})>0$时，$f({{x}{0}})$为极小值。 注：如果$f','({{x}{0}})**=**0$，此方法失效。
这里应该是等于0时，方法失效