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南京初中生必看!分式方程增根求参数,三步拿捏中考高频考点!

  • 2026-06-05 00:55:30
南京初中生必看!分式方程增根求参数,三步拿捏中考高频考点!

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最近有初二学生问我,说分式方程里增根求参数的题总是丢分,尤其是期中、期末考里,这种题简直是送分题变扣分重灾区。

其实在南京历年的期中期末、中考模拟里,分式方程的增根问题几乎是必考常客,比如秦淮区、鼓楼区的统考里,就多次以填空、解答题的形式出现,分值不高但很考验细节,今天就带着大家把这类题的底层逻辑和解题步骤讲透,再搭配南京本地真题练手,看完就能上手

一、先搞懂核心概念:什么是增根?

很多同学做这类题出错,根本原因是没理解增根到底是什么。

分式方程的增根,是去分母后得到的整式方程的根,但它让原分式方程的分母为0,所以不是原方程的根。

换句话说增根有两个特点:

1.它是去分母后整式方程的解;

2.它会让原分式方程的最简公分母为0

我们解题的关键,就是抓住这两个特点,用三步法快速求出参数。

二、三步法拆解:分式方程增根求参数

先看视频里的经典例题,带大家一步步走流程:

第一步:去分母,化为整式方程

分式方程有分母,我们先把它变成整式方程,方便后续计算。

两边同乘最简公分母,注意每一项都要乘,别漏乘常数项

第二步:找增根

增根会让原方程的分母为0,所以令最简公分母等于0,就能求出增根

这里要注意,增根一定是让分母为0x的值,不一定只有一个,如果有多个分母,要把所有让分母为0x都找出来

第三步:把增根代入整式方程,求参数

我们已经知道增根x=2,而增根是整式方程的解,所以把x=2代入第一步得到的整式方程

到这里,参数m的值就求出来了,是不是很清晰?

三、南京本地真题练手(附解题步骤)

光说不练假把式,我们拿南京鼓楼区期末统考的真题来巩固一下,看看和例题的思路是不是一致。

真题:(南京鼓楼区八年级期末统考)

四、容易踩的坑,帮你避坑

1.漏乘常数项:去分母的时候,常数项也要乘最简公分母,很多同学只给含x的项乘,导致整式方程列错,后续全错;

2.漏找增根:当最简公分母有多个因式时,要把所有让分母为0x都找出来,比如上面的鼓楼区真题,就有两个增根,很多同学只算了一个;

3.把“无解”和“有增根”搞混:有增根一定无解,但无解不一定是因为增根,也可能是整式方程无解,这点我们后面再单独讲;

4.最后不检验:虽然这类题不用写检验步骤,但自己要在心里确认,求出的参数对应的增根确实让原方程分母为0,避免计算错误。

五、给初中生的小建议

分式方程是八年级的重点,也是中考的基础题,增根问题看似复杂,其实就是“三步法”的固定套路,多练几道南京本地的真题,就能把套路刻进脑子里。

平时做南京各区的期中期末卷时,遇到这类题,就按“化整式→找增根→代回求参数”的步骤来,别跳步,别粗心,这几分稳稳就能拿到手!

如果大家还想看南京其他区的分式方程真题,或者想了解分式方程无解的题型,都可以在评论区告诉我,下次给大家安排!

南师大211本硕。前南京xes初数老师+教研负责人。
深耕南京教育多年,帮助多位家庭找到孩子的学习内驱力!
分享教育知识,陪同孩子学习进步,促进家庭和谐!
坐标:南京 线下工作室
添加请备注学校+年级,谢谢!
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  1. CONNECT:[ UseTime:0.000509s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000734s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000334s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000256s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000482s ]
  6. SELECT * FROM `set` [ RunTime:0.000195s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000543s ]
  8. SELECT * FROM `article` WHERE `id` = 562048 LIMIT 1 [ RunTime:0.000429s ]
  9. UPDATE `article` SET `lasttime` = 1780607462 WHERE `id` = 562048 [ RunTime:0.016443s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000246s ]
  11. SELECT * FROM `article` WHERE `id` < 562048 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000423s ]
  12. SELECT * FROM `article` WHERE `id` > 562048 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003934s ]
  13. SELECT * FROM `article` WHERE `id` < 562048 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000858s ]
  14. SELECT * FROM `article` WHERE `id` < 562048 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001032s ]
  15. SELECT * FROM `article` WHERE `id` < 562048 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001182s ]
0.113168s