已知线段AB,延长AB到C,使BC=1/3AB,D为AC的中点,若AB=9cm,则DC的长为______.已知:P是线段AB的中点,PA=3cm,则AB=___cm.如图已知点C为AB上一点,AC=12cm,CB=2/3AC,D、E分别为AC、AB的中点,求DE长._______________________A
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![已知线段AB,延长AB到C,使BC=1/3AB,D为AC的中点,若AB=9cm,则DC的长为______.已知:P是线段AB的中点,PA=3cm,则AB=___cm.如图已知点C为AB上一点,AC=12cm,CB=2/3AC,D、E分别为AC、AB的中点,求DE长._______________________A](/uploads/image/z/659237-5-7.jpg?t=%E5%B7%B2%E7%9F%A5%E7%BA%BF%E6%AE%B5AB%2C%E5%BB%B6%E9%95%BFAB%E5%88%B0C%2C%E4%BD%BFBC%3D1%2F3AB%2CD%E4%B8%BAAC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E8%8B%A5AB%3D9cm%2C%E5%88%99DC%E7%9A%84%E9%95%BF%E4%B8%BA______.%E5%B7%B2%E7%9F%A5%EF%BC%9AP%E6%98%AF%E7%BA%BF%E6%AE%B5AB%E7%9A%84%E4%B8%AD%E7%82%B9%2CPA%3D3cm%2C%E5%88%99AB%3D___cm.%E5%A6%82%E5%9B%BE%E5%B7%B2%E7%9F%A5%E7%82%B9C%E4%B8%BAAB%E4%B8%8A%E4%B8%80%E7%82%B9%2CAC%3D12cm%2CCB%3D2%2F3AC%2CD%E3%80%81E%E5%88%86%E5%88%AB%E4%B8%BAAC%E3%80%81AB%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E6%B1%82DE%E9%95%BF._______________________A)
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