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九年级数学圆专题75|画草图，利用垂径定理+勾股定理，求弦的长度
九年级数学圆专题75|画草图，利用垂径定理+勾股定理，求弦的长度
九年级数学《圆》经典高频考题专题培优提升+解题方法和技巧传授70/109
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