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tb3095770
2 năm trước
Bài 1: Cho tam giác ABC vuông tại A(AB < AC) đường phân giác AD. Qua D kẻđường thẳng vuông góc với BC cắt các cạnh AB và AC lần lượt tại F và E. CMR:a) BD.AC=AB.CD b. ACBF đồng dạng ADABc) Tam giác CDF vuông cân.d) CMR: FC^ 2 =CE.CA+FE.FD
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