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2026年4月广东二模数学试卷及答案(附把关题详细解答)

  • 2026-04-24 17:03:12
2026年4月广东二模数学试卷及答案(附把关题详细解答)

今天给大家带来的是广东二模的数学试卷,这张试卷质量还是很不错的,很一些题目是由竞赛/高考题改编而来的。接下来,笔者就分析一下单选压轴,多选压轴,还有填空压轴题。

第八题

一枚质地均匀的骰子,六个面分别标有数字 ,随机投掷该骰子  次,得到的点数依次记为 ,则满足  的有序数对  的个数为

A. 

B. 

C. 

D. 

【答案】 A

【解析】

不妨设三个数排序后为 ,则:

由于等式结果为 ,所以最大值与最小值的差为 。 那么我们从  到  中选出跨度为 2的三个数,共有  个区间:

对于任意一个区间,我们拿例如 举例子,要满足最大最小差为 2,这三个数字必须包含端点,有以下情况:

  1. 三个数互不相同(即 1, 2, 3),全排列: 种;
  2. 有两个较小的数(即 1, 1, 3),排列: 种;
  3. 有两个较大的数(即 1, 3, 3),排列: 种。

每个区间共有  种排列。 因为有 4 个区间,所以符合条件的有序数对共有  个。

因此,选项 A 正确。


第十一题

已知椭圆  为  的右焦点,点  在  上,且关于  轴对称, 分别为线段  的中点, 为坐标原点,则

A. 

B.  的最小值为 

C. 

D. 存在点 ,使得 

【答案】 BCD

【解析】

由椭圆方程知 ,焦距 ,右焦点为 ,左焦点为 

  • 对于 A 选项: 设 ,代入斜率公式计算可得  不是常数,故 A 错误。
  • 对于 B 选项:。当  为椭圆右顶点  时, 取到最小值 。因此  的最小值为 。B 正确。
  • 对于 C 选项: 在  中, 为中点,因此  是中位线,。同时 。 根据椭圆对称性, 到右焦点  的距离等于  到左焦点  的距离,即 。 所以 。C 正确。
  • 这边给大家画了一个GIF图帮助理解,如下
  • 对于 D 选项:。 设 ,利用向量点乘 ,化简可得 。由于 ,这样的点  确实在椭圆上存在。D 正确。

第十四题

正  边形  内接于单位圆 ,任取它的两个不同的顶点  的概率为 _________。

【答案】

【解析】

设两个向量的夹角为 。对不等式两边平方:

解得 ,即夹角 也就是占整个圆周的 

正多边形相邻顶点间的圆心角为 。夹角不超过  意味着两点在圆周上的间隔数最大为:

固定一个点  后,满足条件的点  可以分布在其左侧和右侧各 675 个。那么一共就有  个。

而其余可选的点的总数为 

因此所求概率为 

试题内容如下

答案如下
笔者稍后对大题的把关题进行解析。
这套试卷,整体难度还是有的。广东这边的模考也是值得广大高三生做一做,练练手。
最后两题回归到圆锥曲线和导数,比较经典。都是一些高考和竞赛题改编的,非常巧妙,质量很高。
需要其他把关题的详细解析请私信笔者,笔者将进行手写/视频解答!有看不懂或者是有其他方法的方法可以和笔者私信讨论。或者可以添加笔者微信zzw475215000交流!(添加时请注明来意谢谢)

广告环节

高中数学全程线上课程。
需要的添加笔者微信zzw475215000

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  1. CONNECT:[ UseTime:0.000589s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000851s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000325s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000273s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000527s ]
  6. SELECT * FROM `set` [ RunTime:0.000193s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000707s ]
  8. SELECT * FROM `article` WHERE `id` = 481838 LIMIT 1 [ RunTime:0.006675s ]
  9. UPDATE `article` SET `lasttime` = 1777038403 WHERE `id` = 481838 [ RunTime:0.002488s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000240s ]
  11. SELECT * FROM `article` WHERE `id` < 481838 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000484s ]
  12. SELECT * FROM `article` WHERE `id` > 481838 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000372s ]
  13. SELECT * FROM `article` WHERE `id` < 481838 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001953s ]
  14. SELECT * FROM `article` WHERE `id` < 481838 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016617s ]
  15. SELECT * FROM `article` WHERE `id` < 481838 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009942s ]
0.112222s