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＝&#

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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