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uyen.ikar
2 năm trước
Cho tam giác ABC vuông tai C có góc Ạ = 60°. Tia phân giác của góc A cắt CB tại E. Kẻ EK vuông góc AB(A€AB). a. cm AC= AK và K là trung điểm của AB và AE vô góc với CK. B. cm EB>AC C. Lấy điểm D là hình chiếu của điểm B trên đường thẳng AE. Cm AC, BD, KE cubgf đi qua 1 điểm
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