人6数下：数学广角 鸽巢问题

https://v.qq.com/txp/iframe/player.html?vid=k0388ari0e3&width=500&height=375&auto=0

https://v.qq.com/txp/iframe/player.html?vid=h0182xw5udo&width=500&height=375&auto=0

复制打开网址 www.1ydt.com 下载完整全册word教案试卷及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=o037353sbbl&width=500&height=375&auto=0