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trunglun1002
2 năm trước
Cho DDEK vuông ở D, góc E = 30°. Tia phân giác của góc DKE cắt DE ở B. Kẻ a) CMR: tam giác DIK đều b) CMR: I là trung điểm của EK c) So sánh DK và BE d) Gọi C là hình chiếu của E trên đường thẳng BK. CMR: ba đường thắng BI, CE, DK cùng đi qua một điểm. Giải hộ mình bài này với
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