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dotienthanh2000
2 năm trước
Trên nửa mặt phẳng bờ là tia Ox vẽ hai tia Oz, Oy sao cho: xÔz= 30 độ, xÔy=60 độ a) Tia nào nằm giữa hai tia còn lại ? Vì sao ? b) Tính yÔz. c) Chứng tỏ Oz là phân giác của xÔy ?
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