Chrome，
QQ浏览器
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![人教A高中数学必修五2.2 等差数列[张长锁]【市一等奖】优质课](//imgshow.1ydt.com/img?url=%2F%2Fi2.hdslb.com%2Fbfs%2Farchive%2Fed3fac9029316ba6585b69fe1f6ff55b022f34a7.jpg%40672w_378h_1c_%21web-search-common-cover)
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播放：2 时间：2025-06-21简介： -
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![人教A高中数学必修五2.2 等差数列[张长锁]【市一等奖】优质课](http://imgshow.1ydt.com/img?url=%2F%2Fi2.hdslb.com%2Fbfs%2Farchive%2Fed3fac9029316ba6585b69fe1f6ff55b022f34a7.jpg%40672w_378h_1c_%21web-search-common-cover)
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