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trunghieule2807
2 năm trước
Cho tam giác ABC cân tại A,M là trung điểm BC.Lấy D,E theo thứ tự thuộc AB,AC sao cho góc DME=góc B. a) C/m: Tam giác BDM đồng dạng với tam giác CME. b) C/m: BD.CE ko đổi
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