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tloduy3107
2 năm trước
Cho tam giác ABC đều nội tiếp đường tròn (O), M là điểm trên cung nhỏ BC. Trên MA lấy điểm D sao cho MD=MA. Chứng minh: a) Tam giác BMD là tam giác đều. b) Hai tam giác BDA và BMC bằng nhau. c) MD=MB
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