《2022年人教版中考数学《由一个二元二次方程和一个可以分解为两个二元一次方程的方程组成的方程组》word复习教案2 .pdf》由会员分享，可在线阅读，更多相关《2022年人教版中考数学《由一个二元二次方程和一个可以分解为两个二元一次方程的方程组成的方程组》word复习教案2 .pdf（5页珍藏版）》请在taowenge.com淘文阁网|工程机械CAD图纸|机械工程制图|CAD装配图下载|SolidWorks_CaTia_CAD_UG_PROE_设计图分享下载上搜索。
1、名师精编优秀教案由一个二元二次方程和一个可以分解为两个二元一次方程的方程组成的方程组（2）三、教学步骤（一）明确目标我们已经学过常见的两种类型的二元二次方程组的解法，这一节课我们将进一步系统地复习二元二次方程组的解法关于本节复习课，是对已学习过的二元二次方程组有关内容的复习，所以直接明确本节课的目标，可以充分地调动学生的积极性，使学生能积极思考本节的内容，以提高学生的分析问题和解决问题的能力（二）整体感知由于本节内容是在学生已经学过的基础上进行复习的，其内容主要是熟练、灵活地解前面所学过的简单的二元二次方程组的两种类型，所以，在教学时，通过教师的讲和学生的练，启发学生分析简单的二元二次方程组的
2、特点，寻找解方程组的思路，从而正确地解方程组，同时随时纠正学生在解方程组的过程中出现的问题所以整个课堂能够积极、和谐，从而提高学生分析问题和解决问题的能力（三）重点、难点的学习和目标完成过程复习提问：1解二元二次方程组的基本思想是什么？名师精编优秀教案2解由一个二元一次方程和一个二元二次方程所组成的二元二次方程组的基本方法是什么？其步骤怎样？法来解外，还有没有特殊的解法？应怎样去解？4解由一个二元二次方程组和一个可以分解为两个二元一次方程的方程组成的二元二次方程组的方法是什么？其步骤怎样？作为复习提问中的四个题目，对二元二次方程组中的基本内容作了复习，以便使学生能正确地利用这些基本知识解决本节
3、课的实际内容新课讲解与课堂练习：1解下列方程组：分析与答案：解二元二次方程组，首先应分析方程组的特征，然后根据方程组的特征来确定解方程组的方法对于题目（1），方程是一个二元一次方程，所以，方程组（1）可以用 代入法来解对于方程组（2），符合用代入法解题的特点，可以采用代入法解方程组的特殊解法，所以可以借助于解一元二次方程来解方程组既可以用代入法来解，也可以借助于一元二次方程来解，但要注意的是要检验对于方程组（4），由于方程可以化成两个二元一次方程：文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7
4、C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:
5、CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10
6、HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 Z
7、H7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编
8、码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q1
9、0 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3
10、 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1名师精编优秀教案xy-1 0，3x-y 30，它 们与方程组中的方程组合成两个方程组：分别求解，从而求出原方程组的解对于方程组（5），由于方程可以分解为：xy0，x-y-5 0，它们与方程组成方程组：分别求解，从而解出方程组的解2解方程组：分析：这个方程组是一个分式方程组，如果采用去分母，则很困难，仔细观察两个方程可知，方程中的分母分别为x2或 x、y2或 y，如果设从而可解出原方程组的解为3解方程组文档编码
11、:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10
12、 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3
13、ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档
14、编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q
15、10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R
16、3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1
17、文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1名师精编优秀教案分析：这个方程组的两个方程都不含有未知数的一次项，消去常数项后，就可以得到形如 ax2bxycy20 的方程，解由这个方程与原方程组的任何一个方程组成的方程组，就可以求出原方程组的解解：-4，得x2-5xy 4y2 0 x-y 0 或 x-4y 0原方程组
18、可化为解这两个方程组，得原方程组的解为：（四）总结扩展这节课我们进一步学习了如何解二元二次方程组一般地说，解二元二次方程组时，首先分析方程组的特征，然后根据方程组的特征确定方程组的解法如果发现方程组中的两个方程都不含有一次项的特征，可以采用消去常数项，依照题3 的解法对于某些特殊的方程组，如无理方程组，或分式方程组，经过变形换元后，也可以转化为二元二次方程组的形式来解要注意的是解这类方程组时要进行验根四、布置作业1、P61B 1、2 求下面两个方程组的解：五、板书设计二元二次方程组的解法复习1（1）23（2）解：解：（3）（4）（5）六、作业参考答案文档编码:CN1R6D3N4Q10 HC4R
19、6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7
20、D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN
21、1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC
22、4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7
23、C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:
24、CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10
25、HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1名师精编优秀教案22（1）、（2）均参考1（1）解法（补：）解：（1）3-得 3x2+2xy-y20，可得 3x-y 0，x-y 0，文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:
26、CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10
27、HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 Z
28、H7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编
29、码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q1
30、0 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3
31、 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1文档编码:CN1R6D3N4Q10 HC4R6R8S8R3 ZH7C7D9J6S1