The final edition was revised on December 14th, 2020.二年级上册以内进位加法退位减法带竖式练习题一6421656903552748393683669511146438108207645814664312078792859106588173453075287054391979031574729813456481248682480449321144737634235215068398236414127211947106627760442520437495937936549393462137753234627241242927107377619226705881194688053402748406850392121982497417441