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在討論問題中,如果變數y隨著變數x的而變化,並且對於x取的每一個值,y都有唯一一個值與它對應,那麼稱y是x的函數,記作y=f(x).這裡的f(x)是英文a function of x的簡記.這是我數學書上的,絕對正確,我用手機一個個打字,累死,不給我分你對不起我啊π_π
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