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leedo1901
2 năm trước
1/Cho tam giác ABC với AD là đường phân giác .Biết AB = 4,5cm , AC = 7,2cm , BD = 3,5cm .Tính DC , BC 2/ Cho tam giác ABC với AE là đường phân giác .Biết AB = 12cm , AC = 16cm , BC = 21cm .Tính EB ,EC . 3/ Cho tam giác ABC vuông tại A ,kẻ đường phân giác AD .Biết AB = 15cm , AC = 20cm . Tính EB ,EC .(chính xác đến chữ số thập phân thứ nhất ) 4/ Cho tam giác ABC , kẻ trung tuyến AM.Kẻ đường phân giác ME của tam giác AMB,kẻ đường phân giác MF của tam giác AMC. Chứng minh : EF // BC .
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