小学一年级必学：破十法解20以内退位减法

https://www.baidu.com/from=844b/ssid=0/s?word=100%E4%BB%A5%E5%86%85%E7%A0%B4%E5%8D%81%E6%B3%95%E5%9B%BE%E8%A7%A3&sa=re_dl_prs_34689_1&ms=1&rqid=10186843756276157872&rq=30%E4%BB%A5%E5%86%85%E7%A0%B4%E5%8D%81%E6%B3%95%E5%88%86%E8%A7%A3%E5%9B%BE&rsf=1630001&asctag=24839

https://vn.world.taobao.com/item/752414549593.htm

https://www.sohu.com/a/816078688_121124215

https://m.baidu.com/vsearch/xsppage?pd=video_page&atn=verticalDemote&dsp=iphone&resource_id=5021&from_sf=1&word=18-10%E7%A0%B4%E5%8D%81%E6%B3%95%E5%88%86%E8%A7%A3&title=18-10%E7%A0%B4%E5%8D%81%E6%B3%95%E5%88%86%E8%A7%A3_%E5%B0%8F%E8%A7%86%E9%A2%91&top=%7B%22sfhs%22%3A1%2C%22_hold%22%3A2%7D&pn=0&alr=1&sign=3626641233962696593&se_signs=7027495853721480318_3626641233962696593_13691036906803671640_1563859115616056612_11787907087794289774_13835500859502273181_18012999505551545524_9686209111415524474_13483502656339753084_5116797436128502644&xsp_from=search&lid=11520860439087725719&signs=7027495853721480318_3626641233962696593_13691036906803671640_1563859115616056612_11787907087794289774_13835500859502273181_18012999505551545524_9686209111415524474_13483502656339753084_5116797436128502644&frsrcid=4660&ms=1

https://www.163.com/v/video/VJRGTQKMV.html

https://baijiahao.baidu.com/s?id=1806917333437685354

https://www.sohu.com/a/756614029_121124217

https://www.sohu.com/a/764513902_121124215

https://m.baidu.com/vsearch/xsppage?pd=video_page&atn=verticalDemote&dsp=iphone&resource_id=5021&from_sf=1&word=%E5%87%8F%E6%B3%95%E7%A0%B4%E5%8D%81%E6%B3%95%E5%88%86%E8%A7%A3%E5%BC%8F%E5%9B%BE%E7%89%87&title=%E5%87%8F%E6%B3%95%E7%A0%B4%E5%8D%81%E6%B3%95%E5%88%86%E8%A7%A3%E5%BC%8F%E5%9B%BE%E7%89%87_%E5%B0%8F%E8%A7%86%E9%A2%91&top=%7B%22sfhs%22%3A1%2C%22_hold%22%3A2%7D&pn=0&alr=1&sign=11120281986241055298&se_signs=8424248913743723286_5243443208292786429_4278515950375299050_12490809671226099398_12218710882317338135_11120281986241055298_10032942824817252416_14392316700023220916_8400441722399377023_10815699787074894632&xsp_from=search&lid=10961089358607644621&signs=8424248913743723286_5243443208292786429_4278515950375299050_12490809671226099398_12218710882317338135_11120281986241055298_10032942824817252416_14392316700023220916_8400441722399377023_10815699787074894632&frsrcid=4660&ms=1