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九年级数学：怎么求证CE∥BF？怎么求△BCD的面积？2017株洲中考
九年级数学：怎么求证CE∥BF？怎么求△BCD的面积？2017株洲中考
初中数学，圆的计算和证明，垂径定理，圆周角圆心角，切线，扇形60/233
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