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quynhkhanh26
2 năm trước
(Thêm hình ảnh sẽ được CTLHN+5*+cảm ơn) Cho tam giác đều AOB, trên tia đối của tia OA,OB lấy theo thứ tự các điểm C và D sao cho OC=OD. Từ B kẻ BM vuông góc với AC,CN vuông góc với BD. Gọi P là trung điểm của BC.Chứng minh: a.Tam giác COD là tam giác đều b.AD=BC c.Tam giác MNP là tam giác đều
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