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  trunc(number,m)   ÔÚÕûÊýnumberµÄmλÖýصôm¼°ÒÔºóµÄλÊý:  
  Èç:trunc(15.78,1)=15.7    
        trunc(15.78,-1)=15;  
  round(number,m)   Ó÷¨Í¬trunc,²ÉÓÃËÄÉáÎåÈëµÄ·½Ê½.


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