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lololololo12312312321
2 năm trước
cho nửa đường tròn tâm o đường kính AB M là điểm chính giữa cung AB Trên cung AM lấy điểm N.Trên tia đối của tia MA lấy D sao cho MD=MB.Trên tia đối của tia NBlấy E sao cho NA=NE. Trên tia đối của tia MB lấy C làm tia đối sao cho MC=MA.chứng minh 5 điểm ABCDE cùng thuộc 1 đường tròn
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