如图,在△ABC中,AB=15cm,AC=12cm.AD是∠BAC的外角平分线,DE‖AB交AC的延长线于点E,那么CE=_________.
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![如图,在△ABC中,AB=15cm,AC=12cm.AD是∠BAC的外角平分线,DE‖AB交AC的延长线于点E,那么CE=_________.](/uploads/image/z/2499714-18-4.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CAB%3D15cm%2CAC%3D12cm.AD%E6%98%AF%E2%88%A0BAC%E7%9A%84%E5%A4%96%E8%A7%92%E5%B9%B3%E5%88%86%E7%BA%BF%2CDE%E2%80%96AB%E4%BA%A4AC%E7%9A%84%E5%BB%B6%E9%95%BF%E7%BA%BF%E4%BA%8E%E7%82%B9E%2C%E9%82%A3%E4%B9%88CE%3D_________.)
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