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南京2025年联合体一模压轴题,到底在考孩子什么能力?

  • 2026-05-08 14:09:46
南京2025年联合体一模压轴题,到底在考孩子什么能力?

很多家长看到南京2025联合体一模最后一题,又是抛物线、又是坐标系、又是角度,直接看不懂,觉得太难、太偏。其实不用慌,这道题不是考孩子算得多快,而是考这几类底层能力,看懂这些,你就知道该怎么帮孩子了。

一、这道题真正考的,不是难题,是基础

1. 二次函数的基本功
孩子能不能看懂:抛物线形状一样,就是系数一样;知道过两个点,会用简单形式写函数。
很多孩子不会做,不是不会算,是基础形式不熟、不会设表达式,一上来就慌了。

2. 图像和方程结合的能力
直线和抛物线碰到一起,就是联立方程。
「刚好碰到、不交叉、擦过去」,就是中考必考的相切 = Δ=0。
这是初三下学期最核心、最高频的考点,几乎每套压轴题都用。

3. 几何画图、找临界的能力
题目里的「挡板、遮挡、不能落过去」,本质是让孩子找临界点:
刚好挡住、刚好落得到、刚好不过线。
考的不是死算,是会不会看图、会不会分析情况。

4. 坐标系与几何转换
把长度、角度变成坐标,再算距离、算斜率。
很多孩子几何不错、代数不错,但合在一起就转不过弯,这是拉开差距的关键。

二、为什么孩子一到压轴题就卡壳?

1. 基础不牢,看到复杂题就放弃
交点式、一般式、顶点式乱用,甚至不会设函数,第一步就卡住。

2. 只会刷题,不会理解题意
题目文字一多,就看不懂要干嘛,不知道「遮挡」「相切」对应什么数学条件。

3. 计算不稳,前面会后面错
思路对了,但联立、化简、根式算错,导致整题没分,非常可惜。

4. 心态崩了,直接空着不写
一模难度大、时间紧,孩子默认最后一题很难,看都不看就放弃,其实第一问、第二问往往是送分的。

三、家长在家能帮孩子做的「托举」

不用你会解题,只要抓好这几件事:

1. 抓基础,不盲目刷难题
确保孩子熟练:

◦ 二次函数三种表达式

◦ 直线方程、联立、判别式Δ的用法
基础稳了,压轴题至少能拿一半分。

2. 让孩子重视「审题+画图」
提醒孩子:
先画图,再做题;
把文字条件,变成图像条件;
找到「临界点」,思路就出来了。

3. 规范步骤,能拿的分绝不丢
中考压轴题是按步骤给分:
设函数、联立方程、用Δ=0、写关系式,
哪怕最后答案没算对,步骤写对也能拿分。

4. 稳住心态,比什么都重要
最后这段时间,不要盯着分数骂孩子。
告诉孩子:压轴题能写多少写多少,把能拿的分拿到,就是胜利。

四、给家长的一句话总结

这道联合体一模压轴题,看着复杂,其实考的全是初三下学期核心考点:
二次函数 + 直线相切 + 临界分析 + 几何转换。

孩子现在不会很正常,只要把基础知识点捋顺、解题思路练熟,中考遇到同类题,完全能拿分。
最后阶段,家长少焦虑、多鼓励,帮孩子把基础打牢、心态稳住,就是最好的帮助。

我是南京数学李老师,南京初高中数学教学13年,如果您希望了解更多关于数学的资料咨询,欢迎加入我的家长群,可以扫码加我,拉您到群;请备注学生年级与学校添加我。

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  1. CONNECT:[ UseTime:0.000617s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000814s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000339s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000479s ]
  6. SELECT * FROM `set` [ RunTime:0.000196s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000524s ]
  8. SELECT * FROM `article` WHERE `id` = 552261 LIMIT 1 [ RunTime:0.000392s ]
  9. UPDATE `article` SET `lasttime` = 1778320325 WHERE `id` = 552261 [ RunTime:0.008994s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000257s ]
  11. SELECT * FROM `article` WHERE `id` < 552261 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000453s ]
  12. SELECT * FROM `article` WHERE `id` > 552261 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000381s ]
  13. SELECT * FROM `article` WHERE `id` < 552261 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000666s ]
  14. SELECT * FROM `article` WHERE `id` < 552261 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001354s ]
  15. SELECT * FROM `article` WHERE `id` < 552261 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000677s ]
0.084908s