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這是指數函數吧,而且我們要求的是定義域是屬於整個實數集的,所以,我們的底數a要大於零且不等於一,如果等於一了我們列這個式子就沒有意思了,如果是小於零的就是負數,而我們的負數是沒有負指數幂的,所以指數函數的底數就要求大於零且不等於一.
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