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等式兩邊同時除以XY 1/x+1/y-xy=4/xy 得到1/x+1/y=xy+4/xy 對右邊直接使用基本不等式可以得到1/x+1/y≥4 此時xy=4/xy,得到xy=2,則x+y=8,求得當等式成立時,X=4+根號14,y=4-根號14(根據對成型,x與y值可以互換)
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