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點C將AB分成了(5+7=)12等分,每等分就是AB/12點D將AB分成了(5+11=)16等分,每等分就是AB/16所以,AC長是AB長的5/12 AD長就是AB長的5/16 CD=AC-AD=10故:(5/12 -5/16)AB=10 AB=96cm
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