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2 năm trước
Cho tâm giác ABC cân tại A ( góc A < 90 độ) hai đường cao BE và CF ( E thuộc AC, F thuộc AB) cắt nhau tại D. Chứng minh: a, BE=CF. b, Tam giác BDC cân. c, So sánh độ dài BD và DE.
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