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合肥二模数学试卷分析(续)

  • 2026-04-29 10:15:58
合肥二模数学试卷分析(续)

第12题:考查平面向量模和夹角。

第13题:考查正切函数的图像、周期,以及基本运算。

第14题:直接考了有界变差函数——大学实分析的内容,下放到高中,没接触过的同学直接看懵太正常。想尝试的话,分析这个函数(来自课本的双曲正切函数),研究单调性、奇偶性、值域,再理解符号——两个函数值差的绝对值求和(即有界变差),这里比较难,见上篇图12。估计很多学生不能理解和推出答案。所以区分度想设置在这。不料聪明的学生却能猜出答案。还有学生说:去年模考答案是2,就猜2,何况高考常出2。不得不佩服孩子们猜答案的能力,难怪专家要取消选填,哈哈!

第15题:全概率公式与贝叶斯公式,和课本例题相似度95%。

第16题:第一问是常见的求切线方程,第二问已知两个零点求参数范围。导数放在这个位置,学生要提醒自己:难度其实较小,条件特殊。虽形似压轴题,但只要运算正确,满分不难;一旦出错,就可能变成真正的压轴题。正面分类讨论比分参省时,需熟练因式分解才可。注意最高次系数与零的关系,以及根与定义域的对应。

第17题:考查圆锥曲线。放在这个位置,说明难度也降低了。涉及椭圆的切线方程,能做但计算量大,而此次题目直接给出了切线方程,这一点很好——不让大家死记二级结论,记了也没用。主要思路:设点,利用两个线段乘积与点在椭圆上整体化简为定值;第二问求面积,常用分割法。用所给的点表示梯形面积与两个直角三角形的面积差,再用判别式求范围,最后代出坐标。参考答案则借助第一问的线段乘积为定值,引入其中一个线段为变量表达面积,更简洁。可见第一问是为第二问铺垫的,提醒大家做题要有回顾第一问的意识。

第18题:立体几何。位置后置,难度明显提高。一共设置三问:第一问证线线垂直,用初中所学过的定理:中线是对边的一半的三角形为直角三角形。第二问利用菱形得线线垂直,再做底面的垂线,建系求法向量代入二面角向量公式就行。第三问是给了线段长相等求四棱锥体积最大值——底面积固定,即求高的最大值。大概率用导数求最值,谁作自变量很关键。梯形可分割成三个全等的等腰三角形,从而找到核心量表示。孤立做难度较大,但前两问做了很好铺垫。想起上次去芜湖参加教研活动,有老师问立体几何能否做压轴题,命题专家答复:立体几何不易达到压轴题的难度。

第19题:仿2024年高考真题。引入二分法的新定义,将数列与概率结合,考查读懂信息、提取信息,逻辑推理,数学运算等强大的综合能力。

附:高中语数讲习所的19题讲解视频

没有统一阅卷,所谓网上的预估分数线都不合理。与其在那猜测线是多少,不如让孩子静心分析一下试卷。把自己的水平全部发挥出来,就是成功。

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  1. CONNECT:[ UseTime:0.000643s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000824s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000333s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000328s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000677s ]
  6. SELECT * FROM `set` [ RunTime:0.000276s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000725s ]
  8. SELECT * FROM `article` WHERE `id` = 485840 LIMIT 1 [ RunTime:0.000496s ]
  9. UPDATE `article` SET `lasttime` = 1777495518 WHERE `id` = 485840 [ RunTime:0.031612s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.008233s ]
  11. SELECT * FROM `article` WHERE `id` < 485840 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.005174s ]
  12. SELECT * FROM `article` WHERE `id` > 485840 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005597s ]
  13. SELECT * FROM `article` WHERE `id` < 485840 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001090s ]
  14. SELECT * FROM `article` WHERE `id` < 485840 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001590s ]
  15. SELECT * FROM `article` WHERE `id` < 485840 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001291s ]
0.157805s