20以内加减法竖式计算240题姓名：_ 日期：_ 得分：_ 用时：_51331021121210111261022163428125545311121167232922451828144101628214536111316262354482137224102286310212234211173541114222632842923344222211161714411136921013419273291333229101514133110359121036616215611471415211013511845349145533154728182122581271929731771