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因為4是正數,所以4|x|=|4X|這個原函數的定義域為X>0,現在有了絕對值,函數的定義域就變成了X≠0,所以就是當x=100與x=-100時的函數值相等,就是原影像關於Y軸對稱過去. 我這麼說,看懂了嗎?
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