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播放：0 时间：2025-10-10简介： -
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![北师大数学七下《2.4用尺规作角》[杨老师]【市一等奖】优质课](http://imgshow.1ydt.com/img?url=%2F%2Fi1.hdslb.com%2Fbfs%2Farchive%2F9bb8dc2b06658628660ebc343063f81a4ab4b92f.jpg%40672w_378h_1c_%21web-search-common-cover)
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