设每千克饼干x元,则每千克奶糖（x+1.55）元.15x+8(x+1.55)=110.1515x+8x+12.4=110.1523x=97.75x=4.25x+1.55=4.25+1.55=5.8元答：单价是饼干4.25元/千克,奶糖5.8元/千克,（如果要回答总共多少元的话,则饼干共花了4.25...