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dvct123454321
2 năm trước
Cho góc AOB= $50^{o}$ .Gọi Oc là tai phân giác của góc đó.Gọi OD là tia đối của tia OC.Trên nửa mặt phẳng bờ CD chứa tia OA , vẽ tia OE sao cho DOE= $25^{o}$ .Tìm góc đối đỉnh với DOE
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