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tramy4683
2 năm trước
Cho góc xOy là góc nhọn. Trên tia Ox lấy hai điểm A, C sao cho Oc>OA. Trên tia Oy lấy điểm B sao cho OA -OB. Tia phân giác của góc xOy cắt BC tại E.Ké AH vuông góc với Oy tại H, AH ci OE tai K a) Chứng minh AE - BE, từ đó suy m tam giác AEB là tam giác cần b) Chứng minh OE là trung trực của AB c) Chứng minh tam giác AKB là tam giác cần d) Chứng minh BK vuông góc với Ox e) Cho góc xOy= 70°, Tính số đo các góc của tam giác OAB
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