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xnkgngyn
2 năm trước
cho góc xOy và x'Oy kề bù, vẽ tia Ot là tia phân giác của xOy trên nửa mặt phẳng bờ xx' chứa Ox' vẽ Ot' sao cho Ot' vuông góc với Ot. CMR: Ot' là tia phân giác của góc x'Oy
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