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對於每一個x的值,y只有唯一的值與之對應,那麼y就是關於x的函數 換句話說: 把x當作已知數,y當作未知數,求關於y的方程,如果y不止1個解,則就不是關於x的函數 y²;=3x y=√(3x)或-√(3x)有2個解,所以不是函數
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