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lam2575
2 năm trước
trên đường thẳng aa' lấy một điểm o. trên nửa mặt phẳng có bờ là đường thẳng aa', ta kẻ các tia ob và ox. Gọi OM là tia phân giác của góc AOB. biết góc XOA=a độ, góc XOB= b độ ( a>b ). hãy tính các góc AOB và XOM ( xét hai trường hợp : tia OB nằm giữa hai tia OA,OX và tia OX nằm giữa hai tia OA,OB)
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