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tranminhkhang05121964
2 năm trước
Cho AABC vuông tại C, A = 60° và đường phân giác của góc BAC cắt BC tại E. Kẻ EK vuông góc AB tại K. a) Chứng minh tam giác ACE = tam giác AKE b) Kẻ CH vuông góc AB (H thuộc AB). Chứng minh tam giác ACK đều và CK là phân giác của góc HCB AC+ CB c) Chứng minh CK < AC+CB/2 Nhớ vẽ hình nhé. Hứa 5* và ctlhn
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