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nguyenngoclan1412hd
2 năm trước
Cho tam giác ABC, trực tâm H, nội tiếp đường tròn tâm O a, AH cắt đường tròn tâm O tại E. Chứng minh : E đối xứng với H qua BC b, Gọi D là điểm đối xứng của H qua BC, Chứng minh: D thuộc đường tròn tâm O
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