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Lethanhtam
2 năm trước
Cho tam giác ABC cân tại A có AB=AC=5cm, BC=8cm. Kẻ AH vuông góc BC (H thuộc BC) a. Chứng minh HB=HC b. Tính độ dài AH c.kẻ HD vuông góc AB(D thuộc Ab);HE vuông góc AC(E thuộc AC)CMR:tam giác HDE là tam giác cân
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