Chrome，
QQ浏览器
.
![[0226]四年级数学(人教版)《加法运算定律》-李美芳[吉安县实验小学] | 赣教云](http://imgshow.1ydt.com/img?url=%2F%2Fi1.hdslb.com%2Fbfs%2Farchive%2Fd6323ac4ed253cdad0ced8b900e1b3a5cf885fee.jpg%40672w_378h_1c_%21web-search-common-cover)
![[0309]四年级数学(人教版)《运算定律整理与复习（一）》-王海萍[吉安县实验小学] | 赣教云](http://imgshow.1ydt.com/img?url=%2F%2Fi0.hdslb.com%2Fbfs%2Farchive%2F89572cdf96e2d1d0c892cdf9cdd1c320f63f99d9.jpg%40672w_378h_1c_%21web-search-common-cover)
![[0515]四年级数学(人教版)《整数加法运算定律推广到小数》-胡明芳[吉安师范附属小学] | 赣教云](http://imgshow.1ydt.com/img?url=%2F%2Fi0.hdslb.com%2Fbfs%2Farchive%2F69865cddd5fec35a050b23051a93759b532c00dc.jpg%40672w_378h_1c_%21web-search-common-cover)
.