:=(COST(95)-COST(5))/(COST(95)+COST(5))*100;底部价:COST(底部),DOTLINE,COLORYELLOW;:=100-(COST(95)-COST(5))/(COST(95)+COST(5))*100;顶部成本价:COST(顶部),DOTLINE,COLORWHITE;:=(底部+顶部)/2;均值成本:COST(均值),COLORRED;