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令x+y=k,則k-x=y,代入原式,有 2x^2+3(k-x)^2=4x,化簡得5x^2-(4+6k)x+3k^2=0, 其判別式大於等於0,則(4+6k)^2-60k^2>=0,然後最終可以得到關於k的不等式,該不等式即可找最小值. 嗚嗚嗚嗚嗚嗚嗚嗚嗚嗚,沒趕上15分鐘,哎
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