如图,在△ABC中,AD为∠BAC的平分线,∠ACB=2∠ABC.(1)写出AB,AC,DC的数量关系(2)若DC=4,S△ABC:S△ACD=3:2,求AB的长?(3)比较AB*CD与AC*BD的大小
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![如图,在△ABC中,AD为∠BAC的平分线,∠ACB=2∠ABC.(1)写出AB,AC,DC的数量关系(2)若DC=4,S△ABC:S△ACD=3:2,求AB的长?(3)比较AB*CD与AC*BD的大小](/uploads/image/z/5229489-57-9.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAD%E4%B8%BA%E2%88%A0BAC%E7%9A%84%E5%B9%B3%E5%88%86%E7%BA%BF%2C%E2%88%A0ACB%3D2%E2%88%A0ABC.%281%29%E5%86%99%E5%87%BAAB%2CAC%2CDC%E7%9A%84%E6%95%B0%E9%87%8F%E5%85%B3%E7%B3%BB%EF%BC%882%EF%BC%89%E8%8B%A5DC%3D4%2CS%E2%96%B3ABC%EF%BC%9AS%E2%96%B3ACD%3D3%3A2%2C%E6%B1%82AB%E7%9A%84%E9%95%BF%3F%EF%BC%883%EF%BC%89%E6%AF%94%E8%BE%83AB%2ACD%E4%B8%8EAC%2ABD%E7%9A%84%E5%A4%A7%E5%B0%8F)
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