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vyvy0800
1 năm trước
cho xoy = 60 độ. Trên nữa mặt phẳng bở chứa tia ox có chứa tia oy , vẽ tia oz sao cho xoz = 120 A tính yoz B chứng tỏ oy là phân giác của xoz C goi om là tia đối của tia ox tính zom
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