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phuongny18
2 năm trước
Cho O là một điểm thuộc đường thẳng xy, vẽ tia Oz sao cho nó chia xOy thành 2 góc bằng nhau. Vẽ tia Ot nằm giữa 2 tia Oz và Oy, chia zOy thành 2 góc: zOt và tOy . Biết 2 1  3 6 zOt tOy = . Tính số đo zOt và xOt .
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