如图,在△ABC中,角C=90°,AC=16cm,AB的垂直平分线MN交AC于D,交AB于点E,连接BD,若CD:DB=3:5,求CD的长.图片:file:///C:/Documents%20and%20Settings/Administrator/Application%20Data/360se/ie8data/Temporary%20Internet%20Files/Content.IE

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