5.三分法 low mid2 high mid1=low L (high-low)/3] mil=(high+lon)/3」 mid2=high- LChigh-low)/3 2=2(high+low)/35.三分法 low mid1 mid2 high mid1=low + mid2=high - (high −low)/ 3 (high −low)/ 3   2  2( )/ 3 1 ( )/ 3 mid high low mid high low = + = +