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smlno12003
2 năm trước
Cho AOB = 144 độ và tia Oc là tia phân giác của góc AOB , vẽ tia OM ở trong góc AOB sao cho BOM = 35 độ . a, Tính MOC b, Gọ OB' là tia đối của tia OB , ON là tia phân giác của góc AOC . Chứng minh OA là tia phân giác của góc NOB'.
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