每日总销售额为Px=(a+b/x)x=ax+b每日总成本为1/10x^2+x+100则每日利润为y=(ax+b)-(1/10x^2+x+100) =-1/10x^2+(a-1)x+b-100 =-1/10(x-(a-1)/2)^2+b-100+(a-1)^2/40当x=50时,每日利润达到最大值5000即当x-(a-1)/2=50-(a-1)/2=0时,y取得最大值b-100+(a-1)^2/40=5000联立方程,解得a=101,b=4850