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vothi.ngocbich0209
2 năm trước
:Trên các cạnh Ox và Oy của góc xOy, lấy các điểm A và B sao cho OA= OB. Tia phân giác của góc xOy cắt AB ở M. a) Chứng minh: b) Chứng minh:OM là trung trực của đoạn thẳng AB giúp mình câu b th ạ
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