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[几何] 一道初二几何

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hbghlyj

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hbghlyj posted 2019-7-30 15:04 |Read mode
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若∠A＞60°，则$S_{四边形AA_2B_1C_1}+S_{四边形AB_2A_1C_1}=2S_{△ABC}$。若∠A<60°，结论变为什么？
用三角法显然。要求初中解法。。。
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