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教案精编(二)

  • 2026-04-06 23:57:29
教案精编(二)

8.3 同底数幂的除法

教案精编(二)

一、教材分析

    《同底数幂的除法》是冀教版七年级下册第八章《整式的乘法》第三节的内容,《同底数幂的除法》是初中数学“幂的运算”中的重要组成部分,是继同底数幂的乘法、幂的乘方、积的乘方后学习的第四个基本运算性质。它不仅是整式除法的基础,也为后续学习分式运算及科学记数法等知识提供核心工具。

二、学情分析

  本节是学生已经学习了幂的运算,掌握了同底数幂的乘法、幂的乘方、积的乘方的运算性质,掌握了幂的运算性质的研究思路,学生能够将之前所学知识与本节课新知识相联系,教师引导学生类比思考,归纳出同底数幂的除法运算性质。

三、教学目标

1.经历同底数幂的除法运算性质的获得过程,掌握同底数幂的运算性质,会用同底数幂的运算性质进行有关计算,提高学生的运算能力。

2.了解零次幂和负整指数幂的意义,知道零次幂和负整指数幂规定的合理性。

3.经历同底数幂的除法探究过程,提高学生运算能力和推理能力,体会类比、转化和整体的数学思想。

四、教学重难点

教学重点:

1.掌握同底数幂的除法运算性质,会进行有关计算。

教学难点:

1.同底数幂的除法运算性质的探究。

2.理解零次幂和负整指数幂规定的合理性。

五、教学过程

(一)回顾旧知

  前几节课我们已经学习了幂的运算,掌握了同底数幂的乘法、幂的乘方、积的乘方的运算性质,那同底数幂的除法又有怎样的运算性质呢?我们这堂课一起来探究一下吧!

同底数幂的乘法:

幂的乘方:

积的乘方:

同学们还记得前几节课我们是如何研究这些幂的运算性质的吗?

设计思路:

  利用乘方的意义,进行列式计算,再观察、猜想、验证,最后归纳,经历从特殊到一般的研究过程,那么本节课我们将类比前面的研究思路,一起研究同底数幂的除法。

 【设计意图】:通过回忆幂的运算研究思路,为本节课同底数幂的除法探究做铺垫。

(二)探究新知

  计算下列各式,用幂的形式表示结果,并说明计算的依据。

  根据除法和乘方的意义:

  请同学们仿照老师的思路快速完成(2)(3)(4)题。

  请同学们观察各式左右两边,底数和幂指数发生了什么变化?

  总结发现:同底数幂相除,底数不变,指数相减。

【设计意图】:由特殊到一般,让学生观察以上式子中底数、指数的变化,让学生归纳出幂指数之间的关系.

  根据所发现的规律,让学生大胆猜测:

证明猜想:

概括归纳同底数幂除法的运算性质:

【设计意图】:鼓励学生从不同的角度思考问题,促进学生思维的拓展。

【设计意图】:经历列式计算、观察、猜想、验证、归纳的研究过程,让学生从特殊到一般,掌握了同底数幂的除法运算性质,培养了学生运算能力和推理能力等数学核心素养。

(三)应用新知

师生活动:教师讲解(1)题,(2)(3)(4)学生独立完成,师生共同点评及纠错。

【设计意图】:学生学会用同底数幂除法的运算性质进行有关计算,提高学生的运算能力,渗透从“特殊到一般”的数学思想方法。

(四)当堂训练

第一关:火眼金睛

1.下面的运算是否正确?如果不正确,请改正过来.

第二关:乘胜追击

2.计算

第三关:智慧之峰

【设计意图】:通过闯关游戏,增强学生学习数学的自信心,渗透了整体、转化的数学思想方法。

(五)课堂小结

  本节课,我们学习了哪些知识和内容?蕴含着什么数学思想方法?在同底数幂的除法计算过程中有哪些注意事项?

【设计意图】通过小结,让学生养成整理知识、提炼思想方法的习惯,将课堂收获系统化、结构化,实现核心素养的内化。

(六)课后作业

  巩固性作业:

  探究性作业:

  同学们类比今天的学习过程,探究当幂指数为负数时同底数幂的除法是否适用。

六、设计思路

  通过回忆幂的运算性质,利用乘方的意义,进行列式计算,再观察、猜想、验证,最后归纳,经历从特殊到一般的研究过程。本节课将类比前面的研究思路,一起研究同底数幂的除法。根据除法和乘方的意义,进行计算,从底数和指数都是数字逐渐抽象为字母,使学生在计算过程中深化对算理的理解,为下一步抽象概括出同底数幂的除法的运算性质搭建桥梁。经历观察、猜想、验证、归纳的过程,体会从特殊到一般的思想方法。本节课的核心素养主要表现在运算能力,于是突出“根据同底数幂的除法运算性质进行正确运算”成为例题教学的重点。例题剖析的过程中不断地强调同底数幂相除,底数不变,指数相减.习题从底数是数字→底数是单独的字母→底数是单项式→底数是多项式,从具体到抽象,感受代数的基本思想,进而挖掘本质,突破难点。

END

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  1. CONNECT:[ UseTime:0.000994s ] mysql:host=127.0.0.1;port=3306;dbname=a_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001612s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000602s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000597s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001255s ]
  6. SELECT * FROM `set` [ RunTime:0.002529s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001437s ]
  8. SELECT * FROM `article` WHERE `id` = 471168 LIMIT 1 [ RunTime:0.000945s ]
  9. UPDATE `article` SET `lasttime` = 1775533558 WHERE `id` = 471168 [ RunTime:0.020337s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000582s ]
  11. SELECT * FROM `article` WHERE `id` < 471168 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000926s ]
  12. SELECT * FROM `article` WHERE `id` > 471168 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001260s ]
  13. SELECT * FROM `article` WHERE `id` < 471168 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001271s ]
  14. SELECT * FROM `article` WHERE `id` < 471168 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001620s ]
  15. SELECT * FROM `article` WHERE `id` < 471168 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001674s ]
0.177848s