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Hoaihh
2 năm trước
Cho tam giác ABC vuông tại A . M là trung diểm của cạnh AB .Đường trung trực của cạnh AB cắt cạnh BC tại N .Gọi I là giao điểm của CM và AN. a,Chứng minh tam giác ANB là tam giác cân. So sánh :NAB và NBA b,Nếu IB=IC,Tính số đo của ABC
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