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因為極限是趨於它的情况,要是不加大於0的話就代表可以取到他本身,但是這跟極限沒有關係.等你學到“連續”的定義的時候就會知道二者的區別,連續是要求極限值等於函數值,也就相當於你寫的去掉大於零的那個式子~
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