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九年级数学：△ABE面积取最小值，怎么求tan∠BAD值？自贡中考题
九年级数学：△ABE面积取最小值，怎么求tan∠BAD值？自贡中考题
初中数学：几何最值，将军饮马，费马点，胡不归，隐形圆，阿氏圆170/333
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