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a>0,則x-2>0 a為整數,能被15整除的數為1,3,5,15 當x-2=1時,x=3 a=15 當x-2=3時,x=5 a=5 當x-2=5時,x=7 a=3 當x-2=15時,x=17不滿足條件 a的值為3,5或者15
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