数学题········如图所示,延长线段AB到点C,使BC=三分之一AB,点D为线段AC的中点如图所示,延长线段AB到点C,使BC=三分之一AB,点D为线段AC的中点,若CD=4cm,则线段AB的长是多少cm? ______________________
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![数学题········如图所示,延长线段AB到点C,使BC=三分之一AB,点D为线段AC的中点如图所示,延长线段AB到点C,使BC=三分之一AB,点D为线段AC的中点,若CD=4cm,则线段AB的长是多少cm? ______________________](/uploads/image/z/2524829-5-9.jpg?t=%E6%95%B0%E5%AD%A6%E9%A2%98%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%C2%B7%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%BB%B6%E9%95%BF%E7%BA%BF%E6%AE%B5AB%E5%88%B0%E7%82%B9C%2C%E4%BD%BFBC%3D%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80AB%2C%E7%82%B9D%E4%B8%BA%E7%BA%BF%E6%AE%B5AC%E7%9A%84%E4%B8%AD%E7%82%B9%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%BB%B6%E9%95%BF%E7%BA%BF%E6%AE%B5AB%E5%88%B0%E7%82%B9C%2C%E4%BD%BFBC%3D%E4%B8%89%E5%88%86%E4%B9%8B%E4%B8%80AB%2C%E7%82%B9D%E4%B8%BA%E7%BA%BF%E6%AE%B5AC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E8%8B%A5CD%3D4cm%2C%E5%88%99%E7%BA%BF%E6%AE%B5AB%E7%9A%84%E9%95%BF%E6%98%AF%E5%A4%9A%E5%B0%91cm%3F+++______________________)
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