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2026年山西太原中考二模第15题解读

  • 2026-05-29 01:17:42
2026年山西太原中考二模第15题解读

2026年太原二模填空第15题,这道题是填空里难度最高的一道,它是填空题里面的压轴题,它的难度应该在23题的第二问的难度之上。不少同学拿到手盯着图形半天,没有思路。

辅助线的三个思路是:

连接,延长,做垂直,做平行。

但是孩子们在遇到具体的题的时候,不知道辅助线从什么地方向什么地方做出什么样的辅助线,今天咱们就一步步拆解,不光把这道题解出来,更要搞懂为什么要这么画辅助线,以后遇到同类型题就能举一反三。

先跟着我一起读题,把题干里的关键条件都标出来。

一、梳理已知条件

让我们求线段DF的长。

求线段的长度是山西省中考题填空题压轴题的特点。今年中考的15题很大程度上应该还是这样的题型。

大家先观察,这里有三个核心关键点:第一个是45°角,第二个是线段比例AD=2DC,第三个是DE=DA这个等腰条件。做几何题,抓准这三类条件,思路就有方向了。

二、第一条辅助线:过A作AH垂直于 BC,垂足为H

首先看咱们平时做题总结过,只要图形里出现45°角,想算边长,最常用的办法就是作垂线,构造等腰直角三角形。

过点A向底边BC作垂线,垂足记作H。这样一来, 三角形ABH就是直角三角形,所以它就是等腰直角三角形。还有也可以试着从E点做EG垂直于BC,看看有没有用,

已知斜边AB=3根号2,等腰直角三角形两直角边相等,咱们口算就能算出来:AH=BH=3。

题目里BC总长是9,那剩余的线段HC=BC-BH=9-3=6。

两条直角边AH=3,HC=6,直接用勾股定理求斜边AC:

又因为AD=2DC,也就是说点D把AC分成了2:1的两段,整段AC是3份,AD占2份,DC占1份。

所以AD=2倍根号5,DC=根号5。

题干还说了DE=DA,那自然就有DE=2\根号5,三角形 ADE是等腰三角形,这组边角相等的关系,后面一定会用到。

到这一步,所有能直接算出的线段长度我们都求完了,接下来继续处理点D,想办法把它和底边BC、目标线段DF联系起来。

三、第二条辅助线:过D作DG垂直于 BC,垂足为G

接下来看AD:DC=2:1这个比例关系。刚才我们作了AH垂直于 BC,现在再过点D向BC作垂线,垂足记为G。

大家看,AH和DG都垂直于同一条直线BC,根据平行线判定,垂直于同一直线的两条直线互相平行,也就是DG平行于 AH。

有平行就有相似,所以相似比就等于对应线段的比CD:AC=1:3。

根据相似三角形对应边成比例:解得DG=1。

现在DG=1求出来了,而且三角形 DGF本身就是直角三角形,DF是这个直角三角形的斜边,现在只差角度关系,就能算出DF了。

四、利用等腰三角形推导角度,计算DF

咱们回过头用DE=DA这个条件,DE=DA,所以角ADE中,角AED=角 EAD。

先看角 EAD,它是角ABC的外角,外角等于不相邻两个内角和,所以角EAD=角B+角 C=45°+角 C。

再看角 E,放在角 EBF里分析,结合邻补角、三角形内角和一步步推导,最终能得到:角 FEM=角 C。

再进一步可以推出:角FDG=角FEM。

这就说明Rt三角形 DGF和最开始的Rt三角形CHA形状完全相同,是相似三角形,三边比例也是1:2:根号5。

在RT三角形 DGF中,短直角边DG=1,对应比例里的“1”,斜边DF对应“根号5”这一份的一半,最终算出:

DF=根号5/2

五、课堂总结

最后咱们总结一下这道题的思路,大家记好这几点,以后遇到同类题直接套用:

1. 题干出现45°角,优先作垂线构造等腰直角三角形,快速求边长;

2. 出现线段比例,就作平行线,利用相似三角形转化比例、求线段长;

3. 遇到等腰三角形,核心就是利用“等边对等角”,转化角度关系;

4. 求斜线段长度,尽量把线段放进直角三角形中,结合相似、勾股定理求解。

这道题的难点不在于计算,而在于辅助线的构造。大家把步骤再梳理一遍,把辅助线的作图逻辑想明白,填空压轴题其实也没有那么难。

总之:

这种45°+比例的题,套路很固定”

关键就俩:

“见45°做垂线,构造等腰直角三角形,见比例做垂直或平行”

这道题方法很多,下期分享其它的方法

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  1. CONNECT:[ UseTime:0.000384s ] mysql:host=127.0.0.1;port=3306;dbname=h460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001185s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000860s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000338s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000547s ]
  6. SELECT * FROM `set` [ RunTime:0.000189s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000578s ]
  8. SELECT * FROM `article` WHERE `id` = 519899 LIMIT 1 [ RunTime:0.000382s ]
  9. UPDATE `article` SET `lasttime` = 1780242636 WHERE `id` = 519899 [ RunTime:0.001065s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000284s ]
  11. SELECT * FROM `article` WHERE `id` < 519899 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000474s ]
  12. SELECT * FROM `article` WHERE `id` > 519899 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000323s ]
  13. SELECT * FROM `article` WHERE `id` < 519899 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000542s ]
  14. SELECT * FROM `article` WHERE `id` < 519899 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000851s ]
  15. SELECT * FROM `article` WHERE `id` < 519899 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002934s ]
0.078446s