20以内加减法竖式计算240题姓名：_ 日期：_ 得分：_ 用时：_427137224344321105482622563151814431914537210281415311172911114110163717344811011021122133310142412101115316913124457325613352612711124523151111617233102623221042261323212252198235821845261232101367181545161102273428231228111364292333151341103192179116442922