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ht2728117
2 năm trước
Cho tam giác ABC cân tại A, AB = AC = 5 cm; BC = 6 cm. Kẻ AH vuông tại BC (H thuộc BC) a) Chứng minh HB = HC b) Tính AH. c) Kẻ HD vuông tại AB (D thuộc AB); HE vuông tại AC (E thuộc AC). CMR: tam giác HDE là tam giác cân.
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