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bachduongthpt1304
2 năm trước
Cho tam giác ABC vuông tại A, hình vuông ADEF sao cho D thuộc cạnh AB, E thuộc cạnh BC, F thuộc cạnh AC a) chứng minh rằng : BD.CF= AE^2/2 b) chứng minh rằng BD/CF = AB^2/AC^2 c) Cho biết cạnh hình vuông ADEF bằng 2, BC = 3can5 . Tính cạnh AB và AC
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