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四年级数学《探索多边形的内角和》精品PPT

  • 2026-11-02 14:58:15
四年级数学《探索多边形的内角和》精品PPT

四年级数学《探索多边形的内角和》精品PPT

💯 教学逻辑超清晰
复习三角形内角和 180° 做铺垫
探究长方形 / 正方形内角和 360°
用 "拼一拼"" 分一分 " 的方法推导任意四边形
延伸到五边形、六边形，总结通用公式
试练场 + 终极谜题巩固练习
满载而归的课堂总结，仪式感拉满
📦 配套资源
✅ 19 页精美可编辑 PPT
✅ 详细教案 + 讲稿
✅ 配套学习单
#小学数学[话题]#  #四年级数学[话题]#  #多边形内角和[话题]#  #数学公开课[话题]#  #教学课件[话题]#  #PPT课件[话题]# #数学老师[话题]#  #公开课课件[话题]#

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基本 文件 流程 错误 SQL 调试
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  1. CONNECT:[ UseTime:0.000434s ] mysql:host=172.18.0.4;port=3306;dbname=h_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000582s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000314s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000367s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000505s ]
  6. SELECT * FROM `set` [ RunTime:0.000259s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000742s ]
  8. SELECT * FROM `article` WHERE `id` = 519307 LIMIT 1 [ RunTime:0.000418s ]
  9. UPDATE `article` SET `lasttime` = 1793817085 WHERE `id` = 519307 [ RunTime:0.001133s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000341s ]
  11. SELECT * FROM `article` WHERE `id` < 519307 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000445s ]
  12. SELECT * FROM `article` WHERE `id` > 519307 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000425s ]
  13. SELECT * FROM `article` WHERE `id` < 519307 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000464s ]
  14. SELECT * FROM `article` WHERE `id` < 519307 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000530s ]
  15. SELECT * FROM `article` WHERE `id` < 519307 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000650s ]
0.090671s