Mathematics
Mathematics, 13.12.2021 14:00, lilybrok04

Cho ABC biết ; .Trên tia BA lấy điểm D sao cho BC = BD. Nối C với D, tia phân giác của góc B cắt cạnh AC, DC lần lượt ở E và I.
a. Tính góc A của tam giác ABC.
b. Chứng minh : BED = BEC
c. Chứng minh : IED = IEC

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Cho ABC biết ; .Trên tia BA lấy điểm D sao cho BC = BD. Nối C với D, tia phân giác của góc B cắt c...

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