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isoamylaxetat
2 năm trước
Cho ∆ABC cân tại A, trung tuyến AM. Gọi D là điểm đối xứng với A qua M và K là trung điểm của MC, E là điểm đối xứng của D qua K chứng minh: ABDC là hình thoi chứng minh AMCE là hình chứ nhật Gọi I là giao điểm của AM và BE. Chứng minh rằng: E và B đối xứng qua I chứng minh: AM, CI, EM đồng quy
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