食堂吃掉24棵白菜，还剩47棵，食堂原有多少棵白菜？0I9[0T7[.`
算式：提示'Q4S2M2~5H8o*G;s:W+H5t0c-c0I9[0T7[.`
答：食堂原有+[)Q(O3E-~/M5~(J+S棵白菜。0I9[0T7[.`