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maitran.24121965
2 năm trước
cho tam giác ABC nhọn nội tiếp đường tròn o các đường cao AM và BN cắt nhau tại h gọi D,E lần lượt là giao điểm của AM và BN với o a chứng minh tứ giác nội tiếp ABMN b. Chứng minh CD=CE C. Chứng minh CHD cân
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