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manh1963
2 năm trước
Cho Δ ABC, đường cao BE và CF cắt nhau tại H. a) Chứng minh tứ giác AEHF nội tiếp. Xác định tâm O của đường tròn ngoại tiếp tứ giác AEHF. b)Chứng minh tứ giác BCEF nội tiếp. Kèm hình đã vẽ
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