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f(x) = 2x^2 - 8x + 5 를 a(x - h)^2 + k 형태(표준형/꼭짓점형)로 다시 쓰라
f(x) = 2x^2 - 8x + 5 를 a(x - h)^2 + k 형태(표준형/꼭짓점형)로 다시 쓰라
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