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【难】2025-2026石家庄四十三中九年级期末数学试卷及压轴题解析.

  • 2026-02-07 10:00:16
【难】2025-2026石家庄四十三中九年级期末数学试卷及压轴题解析.
选择压轴题第12题
解:
题型分析:折叠+隐形圆最值问题
①有折叠性质知:对应点的连线被对称轴(折痕)垂直平分,可得∠AFD=90°。
②最值就是构造三角形,最值遇到直角三角形往往取中点构造。
故取AD中点T,连接CT,当点C,F,T三点共线时,CF最小,计算结果如上图所示。
填空题第16题
解:
题型分析:一定一动直线型瓜豆原理。几何原理是旋转性质
点P在AH上运动,意味着AH上的每一个点都绕着点Q逆时针旋转90度得到点N,两点确定一条直线,只需要让点P取两个特殊位置,即可画出点N的运动轨迹,如下图所示:
具体位置计算
故:1/2≤t≤25/8
解答题第22题:我们只研究最后一问
题型分析:切线最值问题
如图:MP始终与OD垂直,则∠MPC的角度始终不变,当MP与圆相切时CP最大!,计算结果如上图所示,利用外角导角和切线长定理可计算。
解答题第23题:我们只研究最后一问
题型分析:动函数与整点问题,此类问题关键点有两个,一是抓住运动中的不变量,二是整点问题先把可能的点描出来,再进行分析判段。
解:易知二次函数开口不变,且始终关于x=1.5对称,所以,当n=2,即有两个整点时,必然是坐标轴上两个关于对称轴对称的点,点(1,0)和点(2,0)。具体计算如下图。
当n=8时,顺着n=2时的情况,函数要向上移动,我们把可能出现的一些点标出来,如下图所示:
先验证C=0时,此时显然不满足,当C<0,即将函数向下平移时,不难发现满足条件。
综合评价:这类动函数整点问题难度比较大,需要扎实的函数功底和画图分析能力。
压轴题第24题:还是只研究最后一问
题型分析:此题没看出最后一问啥模型,就是三角函数解型题,需要锐角三角函数掌握的比较好,当然知道“12345”模型提升解题速度
上图即为:“12345”模型及证明方法
分类讨论:情况①
情况②(这一种情况导出∠DPT=β,发现只有sinβ变了,其余式子没变,直接代入①计算即可)
【1】先导角
【2】确定底和高,我选择的是PE当底
【3】利用三角函数计算,注意sin∠PAH,这一步选择设而不求!
【4】最后就是计算和考虑取舍问题。
【压轴问综合评价】暴力计算对初中生来说挑战性很大,所以在河北中考中往往是压轴问,对于学过高中解三角形的同学来说问题应该不大,属于在中考中为满分选手准备的题型。
最后建议河北中考学子多关注石家庄43中的考试题,质量很高。

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  1. CONNECT:[ UseTime:0.000846s ] mysql:host=127.0.0.1;port=3306;dbname=nowww460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001604s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000688s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.011846s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001399s ]
  6. SELECT * FROM `set` [ RunTime:0.000616s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001486s ]
  8. SELECT * FROM `article` WHERE `id` = 468226 LIMIT 1 [ RunTime:0.002937s ]
  9. UPDATE `article` SET `lasttime` = 1770566558 WHERE `id` = 468226 [ RunTime:0.023290s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000800s ]
  11. SELECT * FROM `article` WHERE `id` < 468226 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001357s ]
  12. SELECT * FROM `article` WHERE `id` > 468226 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005053s ]
  13. SELECT * FROM `article` WHERE `id` < 468226 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002047s ]
  14. SELECT * FROM `article` WHERE `id` < 468226 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014292s ]
  15. SELECT * FROM `article` WHERE `id` < 468226 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009184s ]
0.179883s