Chrome，
QQ浏览器
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![【获奖】冀教版初中数学九上《23.3方差的概念》[齐老师]【市一等奖】优质课公开课教学视频](//imgshow.1ydt.com/img?url=%2F%2Fi0.hdslb.com%2Fbfs%2Farchive%2Fce312d93396427f2c9e3eb9b41b9f34edce86681.jpg%40672w_378h_1c_%21web-search-common-cover)
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播放：0 时间：2026-01-09简介： -
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播放：9 时间：2024-06-20简介：
![【获奖】冀教版初中数学九上《23.3方差的概念》[齐老师]【市一等奖】优质课公开课教学视频](http://imgshow.1ydt.com/img?url=%2F%2Fi0.hdslb.com%2Fbfs%2Farchive%2Fce312d93396427f2c9e3eb9b41b9f34edce86681.jpg%40672w_378h_1c_%21web-search-common-cover)
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