连 加,PPT模板下载：www.1ppt.com/moban/ 行业PPT模板：www.1ppt.com/hangye/ 节日PPT模板：www.1ppt.com/jieri/ PPT素材下载：www.1ppt.com/sucai/ PPT背景图片：www.1ppt.com/beijing/ PPT图表下载：www.1ppt.com/tubiao/ 优秀PPT下载：www.1ppt.com/xiazai/ PPT教程： www.1ppt.com/powerpoint/ Word教程： www.1ppt.com/word/ Excel教程：www.1ppt.com/excel/ 资料下载：www.1ppt.com/ziliao/ PPT课件下载：www.1ppt.com/kejian/ 范文下载：www.1ppt.com/fanwen/ 试卷下载：www.1ppt.com/shiti/ 教案下载：www.1ppt.com/jiaoan/,5,2,1,一共有几只？,1,2,5,5,2,1,一共有几只？,+,+,=,7,8,4,3,1,7,8,5,9,6,10,3,6,9,10,6,3,4,2,7,9,6,3,1,9,10,3+4+1= 4+3+2= 2+2+4= 5+0+3= 7+2+1= 6+4+0=,9,10,4,8,7,5,9,10,9,8,10,10,4,5,连 减,5,2,1,一共有 8 只。,2,2,原来有 8 只。,还剩几只？,8,2,2,=,6,5,10,5,3,7,2,10,8,2,4,4,2,10,1,3,7,6,0,3,0,2,2,0,1,0,1,