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AB=3.6 因為BC=2/3AB,所以可以把AB看成是3份,CB看成是兩份.囙此AC就是5份 因為點D為AC的中點,所以CD就占2.5份.因為CD=3,所以1份就是3/2.5=1.2 AB=1.2*3=3.6
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