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tramhoangtrieu
2 năm trước
cho mon =70 độ .trên đường mặt phẳng chứa tia Om có bờ làm đương thẳng chưa tia On ta vẽ tia Op vuông góc với tia om .Trên nửa mặt phẳng kia ta vẽ tia Oq vuông góc với tia On ,gọi Ox là tia phân giác của góc mon ,Ob là tia phân giác của poq . CMR a,Oa và Ob là 2 tia đối nhau b,tia đối của tia Om nằm giữa 2 tia Ob và Oq
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