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2 năm trước
mn người cho em hỏi câu : trên nửa mặt phẳng bờ chứa tia Ox , vẽ xOy = 70 độ , xÔz = 140 độ a, tính yÔz b, Tia Oy có phải là tia phân giác của xÔz không ? vì sao c, Gọi Ot là tia phân giác của yÔz . Tính xÔt
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