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thuong14121909
2 năm trước
Cho tam giác vuông ABC vuông tại A , có AB<AC . Lấy điểm H trên cạnh AC (điểm H khác A và C) . Gọi E là hình chiếu của điểm H trên cạnh BC 1) C/m tam giác ABC đồng dạng tam giác EHC 2) C/m góc HBC = góc EAC 3) Gọi I là đoạn giao điểm của AE và BH . C/m AB.HI = AI.HE 4) Gọi M là điểm đối xứng với điểm I qua đương thẳng AB. Tìm vị trí điểm H trên AC để diện tích MACB gấp 4 lần IHCE Giúp mình với cần gấp, kh cần làm câu a đâu ạ
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