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tranthuylinh090597
2 năm trước
Bài 2: làm hộ mình câu c) thôi ạ mình cảm ơn cho tam giác ABC, trên cạnh AB lấy điểm D sao cho DA/DB=1/2. Qua D kẻ đường thẳng song song với AC cắt BC tại I. Qua D kẻ đường thẳng song song với BC cắt AC tại E. a) Tứ giác DECI là hình gì? Vì sao? b) Tìm các cặp tam giác đồng dạng trên hình vẽ và tìm tỉ số đồng dạng. c) Tính chu vi tam giác BDI; tam giác ADE; biết chu vi tam giác ABC bằng 12cm
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