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[几何] 关于内心的问题

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hbghlyj posted 2020-4-16 09:01 |Read mode

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由BC延长线上一点D引外接圆切线，切点为E，∠ADB的平分线交BI,CI于F,G，求证AEFI共圆

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2025-6-8 15:56 GMT+8

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