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shudinhat
2 năm trước
Cho tam giác ABC nhọn. Trên tia đối của tia AB lấy AD = AC; trên tia đối của tia AC lấy AE = AB. a/ So sánh BC và DE; b/ ACD và ABE là tam giác gì? c/ Gọi M là trung điểm của BE. Chứng minh: AM vuông góc với BE.
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