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教研活动||精研几何习题 聚力建模提质——奚梅老师三角形角平分线课纪实

教研活动||精研几何习题 聚力建模提质——奚梅老师三角形角平分线课纪实

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深耕习题课

建模促思维

——奚梅老师专题习题课教研活动

为进一步优化初中数学习题课教学模式,夯实学生几何推理核心素养,提升工作室教师课堂教学能力,我校工作室开展了数学专题教研活动。本次活动由奚梅老师执教的《与三角形的角平分线的计算》公开习题课开展,工作室全体数学教师参与听评课,共同探索几何习题课提质增效的实践路径。

Part.01

梯度建模,让几何推理有章可循

本节课以“问题导向”为核心教法,奚梅老师从基础回顾、模型探究到拓展应用,层层递进,为学生搭建了清晰的几何推理阶梯,引导学生掌握三角形角平分线相关计算的通用方法。

锚定知识起点,规范几何语言

课堂开篇,奚老师以三个核心知识点为锚点,带领学生完成知识唤醒,为后续推导扫清障碍:

• 回顾角平分线的定义,强化符号语言表达,规范几何书写格式;

• 梳理三角形外角性质,结合图形巩固“三角形的一个外角等于与它不相邻的两个内角之和”的应用;

• 重申三角形内角和为180°,为后续模型推导提供理论依据。

从文字语言到几何语言的转化训练,帮助学生快速进入课堂状态,筑牢推理根基。

三类模型探究,掌握通用方法

本节课围绕三角形角平分线的三类典型模型展开探究,奚老师引导学生从“特殊”走向“一般”,掌握“倒推分析法”“从特殊到一般”的数学思想,构建结构化的解题思路。

• 模型一:两内角角平分线的夹角

通过例题探究,引导学生采用倒推法分析:先明确目标∠BGC,再拆解为∠GBC+∠GCB,结合角平分线定义和三角形内角和,推导出核心结论:

∠BGC = 90° + ½∠A

课堂中重点强调“目标拆解—条件关联—定理应用”的推理路径,让学生不仅记住结论,更理解推导逻辑。

• 模型二:内角三等分线的夹角拓展

在基础模型上延伸,引导学生类比推导两内角三等分线的夹角与∠A的关系,得出:∠BOC = 120° + ⅓∠A

帮助学生建立“份数思想”,掌握角平分线、三等分线这类问题的通用推导方法。

• 模型三:两外角角平分线的夹角

从内角平分线延伸到外角场景,引导学生结合外角性质,推导∠P与∠A的关系,得出:∠P = 90° - ½∠A

课堂中采用“学生模仿推导+教师规范梳理”的方式,让学生在实践中巩固推理步骤,形成解题模板。

针对性检验,落实方法应用

课堂配套了分层练习,通过“含60°角的三角形内外角平分线夹角计算”等题目,检验学生对模型的掌握情况。课堂中要求学生“说清解题思路、讲出推理依据”,在表达中强化逻辑思维,同时关注学生的书写规范,强调几何证明“从每一步开始,不可漏掉。

Part.02

凝智聚力,共探习题课提质路径

课后,工作室老师们围绕本节课展开了深入研讨,奚梅老师首先进行了自评,随后各位老师各抒己见,既肯定了课堂亮点,也提出了针对性优化建议。

课堂亮点

1. 模型体系清晰,层层递进:奚老师聚焦三角形角平分线的三类模型,构建了从基础到拓展的完整知识体系,梯度化的探究过程帮助学生掌握通用方法,课堂呈现为专题训练,环节完整完善。

2. 方法引导到位,授人以渔:不局限于结论记忆,重点渗透数学思想方法,课堂中以学生的想法为主,鼓励学生自主表达推导思路,充分尊重学生的思维过程,引导学生掌握解题的底层逻辑。

3. 关注学生表达与规范:课堂中重视学生几何语言表达能力的培养,通过让学生口述思路、板书推导过程,强化逻辑思维;同时强调几何书写规范,落实核心素养的培养。

4. 复习铺垫精准,衔接自然:课堂开头的角平分线、三角形外角性质、内角和的复习,为后续模型推导做好了充分铺垫,有效降低了学生的学习坡度。

优化建议

1. 时间与题量调整:本节课题量稍大,部分推导过程略显仓促,可适当删减同类题目,只精讲1-2种核心类型,给学生更多思路梳理与消化的时间,保证推导过程的完整性。奚老师也提到,原本计划引导学生探究“一题多变”的思路,但因时间紧张未能实现,后续可调整课堂节奏,留出时间给学生自主探究。

2. 课堂细节优化:板书时部分内容被遮挡,后排学生看不清,建议调整板书布局;板书的几何图形可画得更规范,帮助学生理解题意;课堂提问可覆盖更多层次的学生,及时捕捉不同学生的思路误区。

3. 拓展探究深化:角平分线到三等分线的拓展,可引导学生自主总结规律,通过表格类比的方式,帮助学生更好地理解“份数变化对结论的影响”;外角平分线模型可适当增加学生自主探究时间,减少教师直接呈现的环节,可采用小组合作探究的方式,让学生充分参与其中。

4. 学生表达习惯培养:后续课堂中要多培养学生主动回答、规范表达的习惯,引导学生完整说出推导条件和过程,避免只关注结论,忽视推理依据;可多给学生鼓励,调动学生的课堂积极性。

5. 分层教学落实:可针对不同层次学生设计分层任务,基础薄弱的学生先巩固核心模型,能力较强的学生再进行拓展延伸,兼顾全员发展;课堂上可多关注学生的不同思路,当学生有独特想法时,可适当从多边形的内角、外角来启发,拓宽学生思维。

Part.03

以研促教,深耕不辍

奚梅老师的这节习题课,打破了“习题课=刷题课”的误区,以模型为载体,以方法为核心,为初中几何习题课教学提供了优秀范例。工作室老师们也在研讨中达成共识:几何习题课的核心,不是让学生做更多题,而是让学生掌握一类题的解题方法、构建结构化的知识模型,让学生从“会做一道题”到“会解一类题”。

教研无止境,且行且思且成长。李静工作室的老师们将以本次教研为契机,继续深耕数学习题课教学,不断探索提质增效的路径,在交流与反思中共同成长,助力学生核心素养的落地生根。

静守教育初心  赋能乡村教师

图文丨淡杨鑫

审核丨李   静

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  1. CONNECT:[ UseTime:0.000641s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000813s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000316s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000230s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000500s ]
  6. SELECT * FROM `set` [ RunTime:0.000238s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000537s ]
  8. SELECT * FROM `article` WHERE `id` = 789441 LIMIT 1 [ RunTime:0.000432s ]
  9. UPDATE `article` SET `lasttime` = 1784854561 WHERE `id` = 789441 [ RunTime:0.014058s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000236s ]
  11. SELECT * FROM `article` WHERE `id` < 789441 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000522s ]
  12. SELECT * FROM `article` WHERE `id` > 789441 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000530s ]
  13. SELECT * FROM `article` WHERE `id` < 789441 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000662s ]
  14. SELECT * FROM `article` WHERE `id` < 789441 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001238s ]
  15. SELECT * FROM `article` WHERE `id` < 789441 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002114s ]
0.118374s