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2026年春人教版五年级数学第八单元教案简案

  • 2026-04-04 02:30:24
2026年春人教版五年级数学第八单元教案简案

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8. 找次品(第 1 课时)简案

一、教学目标

1.初步认识“找次品” 问题,掌握用天平找次品的基本思路。

2.能解决简单的找次品问题(3 个、5 个物品),体会解决问题策略的多样性。

二、教学重点

掌握用天平找次品的基本方法,理解平衡与不平衡的判断逻辑。

三、教学难点

理解“次品在较轻的一端” 的推理过程,初步形成优化意识。

四、教学时数

1 课时(40 分钟)

五、教学过程

1.情境导入(5 分钟):播放 “挑战者号” 失事新闻,引出 “找次品” 的重要性,出示 “3 瓶钙片,1 瓶少 3 片,用天平找次品” 的问题。

2.探究新知(20 分钟):①教学例 1:3 瓶钙片找次品,演示天平平衡(次品是未称的 1 瓶)和不平衡(次品是较轻的 1 瓶)两种情况,得出 “3 个物品称 1 次可找出次品”;②拓展练习:5 瓶钙片找次品,小组讨论不同策略,对比 “分 3 份(2,2,1)” 和 “分 2 份(1,1,3)” 的用时,初步感知优化方向;③方法总结:用天平找次品,可通过平衡与否缩小范围。

3.巩固练习(10 分钟):完成教材 “做一做”;解决 “4 个物品找次品” 的问题;完成练习二十七第 1 题。

4.课堂小结(3 分钟):梳理用天平找次品的基本思路,强调推理过程的重要性。

5.作业布置(2 分钟):①思考 “6 个物品找次品,怎样分称的次数最少”;②完成教材练习二十七第 2 题。

六、板书设计

找次品

(基本思路)用天平判断:平衡/ 不平衡 

缩小范围3 个物品→1 次找出

七、教学反思

能掌握基本找法,推理过程表达不清晰,需加强口头推理训练和思路梳理。

8. 找次品(第 2 课时)简案

一、教学目标

1.掌握找次品的最优策略(平均分3 份,相差 1),能解决 8-9 个物品的找次品问题。

2.归纳“称 n 次最多能分辨 3ⁿ个物品” 的规律,提升逻辑归纳能力。

二、教学重点

掌握“平均分 3 份” 的最优分组策略,确定至少称几次。

三、教学难点

理解“相差 1” 的分组逻辑,推导称次与物品数量的规律。

四、教学时数

1 课时(40 分钟)

五、教学过程

1.复习导入(5 分钟):回顾 3 个物品称 1 次、4 个物品称 2 次的结论,抛出问题 “8 个零件,1 个偏轻,至少称几次”,引出最优策略探究。

2.探究新知(20 分钟):①分组对比:展示 3 种分法 ——(4,4)需 3 次,(2,2,4)需 3 次,(3,3,2)需 2 次,通过天平模拟推理,验证(3,3,2)最优;②9 个物品验证:平均分(3,3,3),称 2 次即可找出,强化 “平均分 3 份” 核心;③规律总结:称 1 次辨 3 个,称 2 次辨 4-9 个,称 3 次辨 10-27 个,提炼 “称 n 次,最多分辨 3ⁿ个物品”;④例题规范:用流程图表达 9 个物品的找次品推理过程。

3.巩固练习:①完成练习二十七第 3 题(9 个零件);②判断 “10 个物品至少称 3 次” 是否正确;③用最优策略分析 12 个物品的分组方法。

4.课堂小结(3 分钟):梳理最优策略(平均分 3 份,不能则差 1),牢记称次与数量的规律。

5.作业布置(2 分钟):①完成练习二十七第 4-5 题;②推导称 4 次最多能分辨多少个物品。

六、板书设计

找次品(最优策略)

分组:平均分3 份(差 1) 

规律:称n 次→最多 3ⁿ个 

例:8 (3,3,2)→2 次

七、教学反思

分组策略掌握较好,规律推导参与度高,少数学生对“相差 1” 理解不深,需加强模拟演示。

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  1. CONNECT:[ UseTime:0.000457s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000796s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000305s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000274s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000496s ]
  6. SELECT * FROM `set` [ RunTime:0.000203s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000636s ]
  8. SELECT * FROM `article` WHERE `id` = 486935 LIMIT 1 [ RunTime:0.000522s ]
  9. UPDATE `article` SET `lasttime` = 1775919380 WHERE `id` = 486935 [ RunTime:0.000825s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000215s ]
  11. SELECT * FROM `article` WHERE `id` < 486935 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000499s ]
  12. SELECT * FROM `article` WHERE `id` > 486935 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000353s ]
  13. SELECT * FROM `article` WHERE `id` < 486935 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000872s ]
  14. SELECT * FROM `article` WHERE `id` < 486935 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000839s ]
  15. SELECT * FROM `article` WHERE `id` < 486935 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002009s ]
0.076065s