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2 năm trước
Cho tam giác ABC cân tại A, trên cạnh AB và AC lần lượt lấy hai điểm E và D sao cho AD = AE, BD cắt CE tại G. Chứng minh rằng: 1) BD = CE. 2) Tam giác GDE cân. 3) Tính chu vi của tam giác ABC biết độ dài hai cạnh là 4,8cm và 10cm. giải hộ mình nhé, mình cho 5 sao và hay nhất, thanks !!!
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