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lvdtthuong02
2 năm trước
Trên cùng một nửa mặt phẳng bờ chứ tia Ox , Vẽ 2 tia Oy,Oz sao cho xOy = 30độ , xOz = 120độ , vẽ Oa là tia đối của tia Ox . Tính aOz và aOy
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