3数下：简单的小数加、减法

https://v.qq.com/txp/iframe/player.html?vid=t0603exxoa4&width=500&height=375&auto=0

https://v.qq.com/txp/iframe/player.html?vid=y1422une980&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=n0387u3q22u&width=500&height=375&auto=0