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yennhiipro
2 năm trước
Cho ABC có ba góc nhọn, với AB < AC. Vẽ ba đường cao AD, BE, CF. a. Chứng minh ∆AEB = ∆AFC. Từ đó suy ra AE. AC = AF.AB b. Chứng minh ∆AFE ~∆ACB. C. Chứng minh góc BFD bằng góc ACB d.c/m FC là tia phân giác của góc EFD e. AD cắt FE và FC lần lượt tại I và H cm IH.AD=AI.HD Giúp mình với mình cần gấp lắm luôn á thanks nhiều câu 5e á
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