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Mathematics, 12.12.2021 14:00 syrai1254

cho tam giác ABC cân tại A,đường cao AD. O là trung điểm AC. D đối xứng với E qua O. Chứng minh AECD là hình chữ nhật

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cho tam giác ABC cân tại A,đường cao AD. O là trung điểm AC. D đối xứng với E qua O. Chứng minh AECD...
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