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教资面试高中数学《等差数列》试讲逐字稿真题模板结构化

  • 2026-03-22 13:44:33
教资面试高中数学《等差数列》试讲逐字稿真题模板结构化

等差数列》试讲逐字稿

面试真题解析

    各位老师好!我是高中数学组的XX号考生,今天我试讲的题目是《等差数列》,下面开始我的试讲。


一、情境导入,激发兴趣:上课!同学们好,请坐!数学就是研究数字规律的学科!来,看PPT四个生活情境,找找规律! 

:(投影)  

  • 情境1:数数游戏,从0开始,隔5数:0,5,,_____。  
  • 情境2:悉尼奥运女子举重体重:48,53,58,63……(kg)  
  • 情境3:水库放水,水位每天降2.5m:18,15.5,13,10.5……  
  • 情境4:银行存款本利和:10072,10144,10216……(元)

:(环顾)四组数,你们看出啥规律?  

:哇,有人说:每两个数差一样!——太敏锐了!  

:(板书课题)对!这四组就是今天主角——等差数列!来,齐读一遍!  


二、师生互动,学习新知:谁用自己话,说说啥是等差数列?  

:A同学说:每项间差值固定!——描述到位!但缺啥?  

:(引导)还有补充?小组讨论30秒!  

:B同学说:从第二项起!理由?  :他说:只有一项,没法差!——解释超合理!  

:(板书定义)对!如果一个数列从第二项起,每项减前一项等于同一个常数,就叫等差数列。这个常数叫公差,用d表示!  

:(投影四情境)来,报公差!  

:情境1:d=5;情境2:d=5;情境3:d=-2.5;情境4:d=72!——全对!初步掌握!  :理解定义要注意啥?小组再议!  

:C同学说:从第二项起 + 差值相等(d常数)!——抓本质!  

:(拓展)若在a、b间插数A,使a、A、b成等差,A=?  

:自己算!  

:(全班)A=(a+b)/2!——对!A叫等差中项!  


三、课堂练习,巩固新知:(投影)课后练习1、2题!2分钟独立做,一会儿抽人说!  

:(巡视)这位同学板书!……对!  


四、学生小结,教师补充:(柔和)这节课你收获啥?  

:有人说:掌握等差定义、公差、中项!——棒!  

:我们学了等差数列定义、性质,生活处处有规律!  


五、结课:课下:  

  1. 查资料,试证通项公式;  
  2. 探究等差数列与一次函数关系;下节课分享!

:好,这节课就到这里。下课!同学们再见!  

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  140. /yingpanguazai/ssd/ssd1/www/no.15386.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.001163s ] mysql:host=127.0.0.1;port=3306;dbname=no_15386;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001673s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000730s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000665s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001378s ]
  6. SELECT * FROM `set` [ RunTime:0.000592s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001405s ]
  8. SELECT * FROM `article` WHERE `id` = 463210 LIMIT 1 [ RunTime:0.001028s ]
  9. UPDATE `article` SET `lasttime` = 1774211436 WHERE `id` = 463210 [ RunTime:0.010415s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000682s ]
  11. SELECT * FROM `article` WHERE `id` < 463210 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001118s ]
  12. SELECT * FROM `article` WHERE `id` > 463210 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001595s ]
  13. SELECT * FROM `article` WHERE `id` < 463210 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001522s ]
  14. SELECT * FROM `article` WHERE `id` < 463210 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003748s ]
  15. SELECT * FROM `article` WHERE `id` < 463210 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004826s ]
0.193253s