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Nguyen178
2 năm trước
Bài 4. (3,5 điểm) Cho tam giác ABC vuông tại A và đường cao AH. Tia phân giác góc B cắt AH tại I và cắt AC tại D. Kẻ DK vuông góc BC (K thuộc BC). a) Chứng minh tam giác ABD = tam giác KBD. b) Chứng minh AI > IH. c) Chứng minh IK // AC. giúp em vs ạ em cảm ơn nhiều
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