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trinhthuyhangnmt
2 năm trước
ai giỏi toán hình thì vào đây: Combo 20 điểm cho 1 bài + 5 sao. mại dô, mại vô bà con ơi!!!!!!!!!! hú!hú!!!!!! 1.Cho tam giác ABC cân tại A. Trên cạnh AB lấy điểm D, trên tia đối của tia CA lấy điểm E sao cho BD CE  . Chứng minh rằng chu vi của tam giác ABC nhỏ hơn chu vi của tam giác ADE.
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