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quynhhuong2002
2 năm trước
Cho tam giác ABC vuông tại B , tia phân giác góc C cắt AB ở D . Từ D kẻ DE vuông góc AC . Chứng minh : a) DE = DB b) DA lớn hơn DB c) DE cắt BC tại F , Cd cắt AF tại I . Chứng minh : CI vuông góc AF Các bạn giúp mình câu c với ạ
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