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f'(x)=0時求的是極值點.當極值點左增右减時,極值點為極大值.當極值點左减右增時,極值點為極小值.極值點不一定為最值點,當函數所在定義域內端點值不大於極值時極大值變為最大值.(最小值同理)f'(x)=0求的是點不考慮單調性,因為一個點是沒有單調性的.
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