<p><span style="color: rgb(237, 35, 8);">第一单元</span></p> <p><a href="https://qingbei.com/bytelive/8443/730271?aid=32&amp;amp;device_id=&amp;amp;live_id=7684" target="_blank">《观察物体》例1教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/951662?aid=32&device_id=&live_id=10058" rel="noopener noreferrer" target="_blank">《观察物体》例2教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/774054?aid=32&device_id=&live_id=11374" target="_blank">《观察物体》练习课</a></p> <p><span style="color: rgb(237, 35, 8);">第二单元</span></p> <p><a href="https://qingbei.com/bytelive/8443/914178?aid=32&device_id=&live_id=12066" target="_blank">《因数和倍数》例1教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/379740?aid=32&device_id=&live_id=12653" target="_blank">《因数和倍数》例2教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/007788?aid=32&device_id=&live_id=14473" rel="noopener noreferrer" target="_blank">巜求一个数的倍数》</a>教学视频</p> <p><a href="https://qingbei.com/bytelive/8443/858255?aid=32&device_id=&live_id=16542" rel="noopener noreferrer" target="_blank">《2、5的倍数的特征》</a>教学视频</p> <p><a href="https://qingbei.com/bytelive/8443/730641?aid=32&device_id=&live_id=17624" target="_blank">《3的倍数的特征》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/501007?aid=32&device_id=&live_id=18153" target="_blank">《质数和合数》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/3642947?aid=32&device_id=&live_id=20467" target="_blank">《因数与倍数的练习课》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/4655562?aid=32&device_id=&live_id=22815" target="_blank">《两数之和的奇偶性》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/8269220?aid=32&device_id=&live_id=23989" target="_blank">《因数与倍数的整理和复习》教学视频</a></p> <p><span style="color: rgb(237, 35, 8);">第三单元</span></p> <p><a href="https://qingbei.com/bytelive/8443/5285543?aid=32&device_id=&live_id=24671" target="_blank">《长方体的认识》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/1489543?aid=32&device_id=&live_id=27604" target="_blank">《正方体的认识》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/2063655?aid=32&device_id=&live_id=29859" target="_blank">《长方体和正方体认识练习课》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/6282008?aid=32&device_id=&live_id=30882" target="_blank">《长方体和正方体展开图》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/4682094?aid=32&device_id=&live_id=31552" target="_blank">《长方体和正方体的表面积》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/1449204?aid=32&device_id=&live_id=33984" target="_blank">《体积和体积单位》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/7512438?aid=32&device_id=&live_id=35990" target="_blank">《长方体和正方体体积计算》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/3768876?aid=32&device_id=&live_id=37124" target="_blank">《表面积和体积练习课》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/9104674?aid=32&device_id=&live_id=37677" target="_blank">《体积单位间的进率》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/7887607?aid=32&device_id=&live_id=40045" target="_blank">《容积和容积单位》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/6611156?aid=32&device_id=&live_id=42250" target="_blank">《求不规则物体的体积》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/9203535?aid=32&device_id=&live_id=43278" target="_blank">《综合练习课》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/8099495?aid=32&device_id=&live_id=43749" target="_blank">《整理和复习》教学视频</a></p> <p><a href="https://qingbei.com/bytelive/8443/3030412?aid=32&device_id=&live_id=45851" target="_blank">《练习课》教学视频</a></p>