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若 x 1 + x 2 = 3 , x 1 2 + x 2 2 = 5 ,则以 x 1 , x 2 为根的一元二次方程是 ( )
x 2 - 3 x + 2 = 0
x 2 + 3 x - 2 = 0
x 2 + 3 x + 2 = 0
x 2 - 3 x - 2 = 0
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