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樓上的基礎概念不扎實, 二次函數是引數最高幂是2,引數的幂可以是2,1,0的的函數,冪函數的引數的最高次是任意的. y=ax^2 + bx + c(a≠0)就是二次函數 y=x^a就是冪函數 值得指出的是,二次函數不是冪函數,因為它不一定符合y=x^a
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