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truongquynh12
2 năm trước
Cho góc nhọn xOy, trên tia Ox lấy điểm A, trên tia Oy lấy điểm B sao cho OA=OB. Trên tia Ax lấy điểm C trên tia By lấy điểm D sao cho AC=BD a). Chứng minh: AD=BC. b). Gọi E là giao điểm AD và BC. Chứng minh ∆EAC=∆EBD. c). Chứng minh: OE là phân giác của góc xOy.
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