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lanvy278
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Làm giúp mình với.Mình sắp phải nộp rồi Trên đường thẳng xy lấy một điểm O. Vẽ tia Ot sao cho xOt=yOt a.Tính số đo xOt;yOt b. Trên một nửa mặt phẳng có bờ là đường thẳng xy và chứa tia Ot,vẽ yOn=50°. Chứng minh rằng: tia On nằm giữa tia Ot và tia Oy. Tính số đo nOt
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