已知二次多項式f(x)滿足f(－1)=3，f(1)=1，f(2)=3，求f(x)＝　　　　　　　。

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已知二次多項式f(x)滿足f(－1)=3，f(1)=1，f(2)=3，求f(x)＝　　　　　　　。

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