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f(x) = 2x^2 - 8x + 11 을 표준형 a(x - x_V)^2 + y_V 로 다시 쓰라
f(x) = 2x^2 - 8x + 11 을 표준형 a(x - x_V)^2 + y_V 로 다시 쓰라
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