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nvudien070809
2 năm trước
trên cung một nữa mp bờ là đường thẳng chứa tia Ox, vẽ hai tia OA và OB sao cho xOA= 68độ ; xOB= 136độ a) trong ba tia Ox, OA, OB tia nào nằm giữa hai tia còn lại? vì sao? b) tính số đo góc AOB c) tia OA phải là tia phân giác của góc xOB không ? vì sao d) vẽ tia OT là tia phân giác của góc AOB. tính số đo góc AOt và góc BOt
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