二数下 1000以内数的认识

https://v.qq.com/txp/iframe/player.html?vid=n05559dqjzq&width=500&height=375&auto=0

https://v.qq.com/txp/iframe/player.html?vid=r0555shwz9q&width=500&height=375&auto=0
复制网址 www.1ydt.com 打开下载完整全册word试卷教案及PPT课件点击阅读原文看全部教学内容

https://v.qq.com/txp/iframe/player.html?vid=u0126b429to&width=500&height=375&auto=0