延长线段ab到c使bc=½ab,反向延长ac到d,使ad=½ac,若ab=8cm,则cd=________.

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延长线段ab到c使bc=½ab,反向延长ac到d,使ad=½ac,若ab=8cm,则cd=________.
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延长线段ab到c使bc=½ab,反向延长ac到d,使ad=½ac,若ab=8cm,则cd=________.
延长线段ab到c使bc=½ab,反向延长ac到d,使ad=½ac,若ab=8cm,则cd=________.

延长线段ab到c使bc=½ab,反向延长ac到d,使ad=½ac,若ab=8cm,则cd=________.
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