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baoanh01091999
2 năm trước
Cho 2 góc kề bù xOz và yOz trong đó xOz = 50 độ . Trên nửa mặt phẳng có bờ xy có chứa tia Oy , vẽ tia Ot .Giả sử yOt = a độ . Xác định giá trị của a để tia Oz là tia phân giác của xOt
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