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黄蒙蒙||期末试卷11分析

  • 2026-06-29 07:07:07
黄蒙蒙||期末试卷11分析
试卷10的几道题非常好，学生出错较高，下面分析一下15,21,22题
15题
这个题给了一个新定义，考查的是平面直角坐标系的知识点。由点C、D的坐标可知线段CD与y轴平行，点M在线段CD上，所以点M的横坐标为2，设点M（2，m）,则-2≤m≤1.因为点M是点N（n，2n-1）的斜移点，所以有n-2=2n-1-m，所以m=n+1.因为-2≤m≤1，所以-2≤n+1≤1，所以
-3≤n≤0.
21题
第二问：因为EG,EH分别平分∠MEF和∠AEM，所以∠MEH=1/2∠AEM，
∠MEG=1/2∠FEM所以∠GEH=∠MEH-∠MEG=1/2∠AEM-1/2∠FEM=1/2(∠AEM-∠FEM)=1/2∠AEF
因为AB∥CD，所以∠AEF=∠EFD
所以∠GEH=1/2∠EFD
22题
第二问：由平移可得点C(2,0),D(5,0)
所以CD=3
设点P（0，m）
所以S△PCD=1/2CD|m|=9
所以m=6或-6
所以点P（0,6）或（0,-6）
第三问：分三种情况
（1）当点P在AB上方时
∠PDC=∠BPD+∠PBA
(2)当点P在AB和CD之间时
∠BPD=∠PBA+∠PDC
（3）当点P在CD下方时
∠PBA=∠BPD+∠PDC
以上三种情况，都是过拐点P作平行，根据内错角转换成所求的三个角的关系。
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  1. CONNECT:[ UseTime:0.000773s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000903s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000344s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000277s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000515s ]
  6. SELECT * FROM `set` [ RunTime:0.000217s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000672s ]
  8. SELECT * FROM `article` WHERE `id` = 506176 LIMIT 1 [ RunTime:0.001579s ]
  9. UPDATE `article` SET `lasttime` = 1782696268 WHERE `id` = 506176 [ RunTime:0.004983s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000263s ]
  11. SELECT * FROM `article` WHERE `id` < 506176 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000458s ]
  12. SELECT * FROM `article` WHERE `id` > 506176 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003357s ]
  13. SELECT * FROM `article` WHERE `id` < 506176 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000800s ]
  14. SELECT * FROM `article` WHERE `id` < 506176 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000762s ]
  15. SELECT * FROM `article` WHERE `id` < 506176 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001733s ]
0.163080s