Độ dài các cạnh của tam giác ABC tỷ lệ với 2 : 3 : 4, BD là đường phân giác trong ứng với cạnh ngắn nhất AC, chia AC thành hai đoạn AD và CD. Nếu độ dài AC là 21, thế thì độ dài của đoạn dài hơn trong hai cạnh AD và CD là: * 1 điểm 8 9 10 12

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