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vantrinh28042001
2 năm trước
cho đường tròn O đường kính AC. C là 1 điểm trên đường tròn sao cho AC> BC, Tiếp tuyến với O tại A cắt BC tại E. Tiêp tuyên với O tại C cắt AE tại M. Kẻ CD vuông góc với AB. I là giao điểm MO và AC, K là giao MB với CD. CMR IK//AB
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