Chrome，
QQ浏览器
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![高中教材上没有的射影定理，大有用处！[高一春季5]](//imgshow.1ydt.com/img?url=%2F%2Fi0.hdslb.com%2Fbfs%2Farchive%2F7813c6d795c699d15165603c47be5eb164daacdb.jpg%40672w_378h_1c_%21web-search-common-cover)
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![三角形面积、周长最值，与均值不等式综合[高一春季6]](//imgshow.1ydt.com/img?url=%2F%2Fi2.hdslb.com%2Fbfs%2Farchive%2F75eefdd5b7c2d238cd50059340fec8602b37919a.jpg%40672w_378h_1c_%21web-search-common-cover)
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播放：24 时间：2024-06-19简介： -
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![高中教材上没有的射影定理，大有用处！[高一春季5]](http://imgshow.1ydt.com/img?url=%2F%2Fi0.hdslb.com%2Fbfs%2Farchive%2F7813c6d795c699d15165603c47be5eb164daacdb.jpg%40672w_378h_1c_%21web-search-common-cover)
![三角形面积、周长最值，与均值不等式综合[高一春季6]](http://imgshow.1ydt.com/img?url=%2F%2Fi2.hdslb.com%2Fbfs%2Farchive%2F75eefdd5b7c2d238cd50059340fec8602b37919a.jpg%40672w_378h_1c_%21web-search-common-cover)
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