Chrome，
QQ浏览器
.
![[一年级数学]计算一本通，第二讲：突破进退位加减法](http://imgshow.1ydt.com/img?url=%2F%2Fi1.hdslb.com%2Fbfs%2Farchive%2Ffbe848172b311130f1e7e1b67bf9e927179eaa4b.jpg%40672w_378h_1c_%21web-search-common-cover)
![[0423]一年级数学(人教版)《两位数减一位数的退位减法》-甘霞[宜春实验小学] | 赣教云](http://imgshow.1ydt.com/img?url=%2F%2Fi1.hdslb.com%2Fbfs%2Farchive%2Fab0944e269d1739dffbaa3324276a6779fc43ed3.jpg%40672w_378h_1c_%21web-search-common-cover)
.