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八年级数学：AC=AE，怎么求证CE=CF？正方形培优，辅助线添加方法
八年级数学：AC=AE，怎么求证CE=CF？正方形培优，辅助线添加方法
初中数学，怎么添加辅助线？辅助线添加技巧，培优专题45/78
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