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ngocanh82
2 năm trước
Cho đường tròn tâm O bán kính OA và OB , trên cung nhỏ AB lấy các điểm M,N sao cho AM =BN . Gọi C là giao điểm của các đường thẳng AM và BN CMR : a, OC là tia phân giác góc AOB b, OC vuông góc với AB
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