(2010?上海)如图,△ABC中,点D在边AB上,满足∠ACD=∠ABC,若AC=2,AD=1,则DB=______
(2010?上海)如图,△ABC中,点D在边AB上,满足∠ACD=∠ABC,若AC=2,AD=1,则DB=______....
(2010?上海)如图,△ABC中,点D在边AB上,满足∠ACD=∠ABC,若AC=2,AD=1,则DB=______.
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