Category: 17级
200528-等差数列前n项和-22170620
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https://v.youku.com/v_show/id_XNDY5MDAyODAzNg==.html
200528-等差数列求和1-22170638
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200611-平方差公式说课-22170640
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200528-气压带和风带的形成-22171020
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https://survey.nnuteachskill.com/index.php?r=survey/index&sid=956437&lang=zh-Hans
