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播放：0 时间：2025-08-15简介： -
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![[全294集]2025暑假必看【北师大版小学数学 四年级数学上册/下册数学]四年级上册数学课本同 步+专项培优精讲课堂视频配套讲义习题PDF](//imgshow.1ydt.com/img?url=%2F%2Fi1.hdslb.com%2Fbfs%2Farchive%2Fdefbf3bb1838535ed565afefc810568ff5889148.jpg%40672w_378h_1c_%21web-search-common-cover)
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![[全294集]2025暑假必看【北师大版小学数学 四年级数学上册/下册数学]四年级上册数学课本同 步+专项培优精讲课堂视频配套讲义习题PDF](http://imgshow.1ydt.com/img?url=%2F%2Fi1.hdslb.com%2Fbfs%2Farchive%2Fdefbf3bb1838535ed565afefc810568ff5889148.jpg%40672w_378h_1c_%21web-search-common-cover)
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