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初中数学：怎么求x²+y²的最小值？等腰直角三角形，经典培优题
初中数学：怎么求x²+y²的最小值？等腰直角三角形，经典培优考题
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆150/333
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