数学《排出花边顺序》

活动前的拍手歌
http://s2/mw690/0039PkFOzy7aVUfk3ux01&690
http://s10/mw690/0039PkFOzy7aVUfu3EZ39&690
数学排序操作中
http://s9/mw690/0039PkFOzy7aVUfGTY448&690
http://s8/mw690/0039PkFOzy7aVUfQ5Jta7&690
http://s14/mw690/0039PkFOzy7aVUg0yeh3d&690
http://s2/mw690/0039PkFOzy7aVUg8rlf91&690
http://s14/mw690/0039PkFOzy7aVUgi16R5d&690
报纸球的现场制作。
http://s15/mw690/0039PkFOzy7aVUgscxMbe&690
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