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刷遍近5年南京中考真题,我发现二次函数压轴题的“送分”规律!

  • 2026-06-14 09:20:42
刷遍近5年南京中考真题,我发现二次函数压轴题的“送分”规律!

开篇:二次函数压轴题,真的那么难吗?

每年中考结束,都有家长问我:“老师,最后一道二次函数题,我家孩子连看都不敢看,直接放弃了。”

我听了既心疼又着急。这道题,其实是最有“套路”的送分题!

作为研究南京中考十几年的老师,我把近5年的二次函数压轴题全部拆解了一遍,发现了一件惊人的事:这12分的题目,每年的设问方式几乎一模一样!

今天,我就把这套“送分规律”毫无保留地分享给你。

一、南京中考二次函数考查全景图

先来看一组数据:

2024年:28分,第27题,解析式+参数+存在性

2023年:26分,第27题,解析式+最值+存在性

2022年:27分,第27题,解析式+参数+探究

2021年:25分,第27题,解析式+几何综合

2020年:26分,第27题,解析式+动点问题

发现了吗?

二次函数每年都是28分左右,占比近1/4

压轴题固定在第27题,分值12分

第一问永远是求解析式(送分3-4分)

第二问通常是参数范围或最值问题(中档4-5分)

第三问是存在性探究(较难3-4分)

二、二次函数压轴题的“三段式”结构

南京中考的二次函数压轴题,结构极其稳定,我称之为“三段式”

第一段:求解析式(3-4分,必拿!)

常见考法:

已知三点坐标,求抛物线解析式

已知顶点和一点,求解析式

已知与x轴交点和另一点,求解析式

解题套路:

设解析式(一般式/顶点式/交点式)

代入已知点坐标

解方程组

写出最终解析式

这道题,熟练的孩子30秒就能写完。但每年仍有大量孩子在这里丢分——因为计算出错!

第二段:参数范围或最值(4-5分,努力拿!)

常见考法:

求参数m的取值范围

求线段长度的最大值/最小值

求三角形面积的最大值

解题套路:

根据题意设未知数

建立函数关系式

利用二次函数性质求最值,或解不等式求范围

核心技巧:

最值问题:配方或利用顶点公式

范围问题:注意临界状态,画出草图

第三段:存在性探究(3-4分,争取拿!)

常见考法:

是否存在点P,使得三角形PAB为等腰三角形?

是否存在点Q,使得四边形ABQC为平行四边形?

是否存在点M,使得角AMB=90度?

解题套路:

假设存在,设出点的坐标(通常用参数表示)

根据条件列方程

解方程,检验合理性

写出结论

关键提醒:存在性问题一定要分类讨论!比如等腰三角形,要分三种情况:PA=PB、PA=AB、PB=AB。

三、近5年真题规律总结

规律1:解析式求解越来越“隐蔽”

早期的题目直接给三个点,现在的题目可能给的是:对称轴+两个点的纵坐标、与x轴交点距离+顶点纵坐标、需要先用其他条件求出点的坐标。

应对策略:不管怎么包装,核心都是“待定系数法”。关键是把已知条件“翻译”成点的坐标。

规律2:几何背景越来越丰富

近两年的题目,二次函数往往与以下几何图形结合:等腰直角三角形、相似三角形、圆(切线、直径等)

应对策略:熟练掌握几何图形的性质,特别是特殊点的坐标特征。

规律3:存在性问题“换汤不换药”

虽然每年的具体问法不同,但本质都是:等腰三角形存在性、直角三角形存在性、平行四边形存在性、相似三角形存在性。

应对策略:把这几类问题的通用解法整理成“模板”,考场上直接套用。

四、给孩子的3个备考建议

1. 建立“二次函数压轴题”专项训练本

把近5年的南京中考二次函数压轴题全部做一遍,不是做完就完,要记录每道题的解题时间,分析每道题的丢分原因,总结同类题目的解题模板。

2. 限时训练,模拟考场压力

二次函数压轴题建议用时15-20分钟。平时训练要严格计时,培养时间观念。很多孩子平时会做,考场上做不完,就是因为缺乏限时训练

3. 重视“会而不对”的丢分

二次函数压轴题的计算量很大,一步算错,满盘皆输。建议:解方程后一定要检验,求出的坐标要代入验证,写答案前检查单位、符号。

如果你家孩子也在二次函数方面遇到困难,欢迎在后台留言或添加我的微信,发试卷给我帮你做个免费诊断。

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  1. CONNECT:[ UseTime:0.001061s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001602s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000751s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000717s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001320s ]
  6. SELECT * FROM `set` [ RunTime:0.006521s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001578s ]
  8. SELECT * FROM `article` WHERE `id` = 573744 LIMIT 1 [ RunTime:0.004420s ]
  9. UPDATE `article` SET `lasttime` = 1782206664 WHERE `id` = 573744 [ RunTime:0.045672s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000447s ]
  11. SELECT * FROM `article` WHERE `id` < 573744 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000463s ]
  12. SELECT * FROM `article` WHERE `id` > 573744 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000491s ]
  13. SELECT * FROM `article` WHERE `id` < 573744 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005464s ]
  14. SELECT * FROM `article` WHERE `id` < 573744 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001597s ]
  15. SELECT * FROM `article` WHERE `id` < 573744 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003257s ]
0.251708s