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증명하라: f(x) = ax^2 + bx + c 의 꼭짓점의 x좌표는 근(존재할 때)의 평균이다
증명하라: f(x) = ax^2 + bx + c 의 꼭짓점의 x좌표는 근(존재할 때)의 평균이다
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