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thonguyentraind
2 năm trước
Cho tam giác ABC cân tại A . Trên tia đối của tia AB lấy D , trên tia đối của tia AC lấy E sao cho AD = AE . Gọi M là trung diểm BC , chứng minh : D đối xứng với E qua AM ( giúp em với )
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