2021·全国·模拟预测
名校
1 . 2021年8月,在东京奥运会的某个项目上,有来自5个国家的选手甲、乙、丙、丁、戊参加这个项目的金牌争夺赛.赛前,小明一家人对金牌得主进行了预测,他们的观点如下:
①爸爸认为金牌得主不是乙,就是丁;
②妈妈认为金牌得主既不是丙,也不是丁;
③小明认为金牌得主不是甲,就是戊.
若比赛结束后,可以肯定三人中只有一个人的预测结果正确,则金牌的得主是( )
①爸爸认为金牌得主不是乙,就是丁;
②妈妈认为金牌得主既不是丙,也不是丁;
③小明认为金牌得主不是甲,就是戊.
若比赛结束后,可以肯定三人中只有一个人的预测结果正确,则金牌的得主是( )
A.甲 | B.乙 | C.丁 | D.戊 |
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2 . 已知
是
的直径,M是圆上不同于A、B的任意一点,
、
的斜率分别为
、
,则
(∵
)
类比到椭圆中,
是过椭圆
(
)中心的弦,M是椭圆上不同于A、B的任意一点,
、
的斜率分别为
、
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6438d0e12b0606fa901265403de43df4.png)
______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3503d330608e7138d1b529aba4512fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/546a035918f025942ca99b9ffebd8eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd6a1d6fab318824426e52464a575e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4581644268c6ad0c86efc46b95b165.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada25f76504c3fd1226da43c94cb4277.png)
类比到椭圆中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b66a5b7813e902306477f91f9f4084cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/546a035918f025942ca99b9ffebd8eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbd6a1d6fab318824426e52464a575e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6438d0e12b0606fa901265403de43df4.png)
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2021-11-23更新
|
839次组卷
|
3卷引用:山东省济南市历下区山东师范大学附属中学2021-2022学年高二上学期期中数学试题
3 . 已知一元三次方程
的三个根分别为
、
、
,请类比一元二次方程的韦达定理的证明,给出一元三次方程的根与系数的关系并且给出相应证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eccb3856fa5aa8dc822a593ec88ca2bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c814128ea2139e33db94ea590e7c2223.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec19b68e3add9d5bfcc6269a1855b87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/291c25fc6a69d6d0ccfb8d839b9b4462.png)
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4 . 将
替换为复数
,以下关于向量模的性质类比到复数中:
①
类比为
;
②
类比为
;
③
类比为
;
④
,类比为
.
复数的结论仍成立的序号是___________
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb80eb942aafb194fadc473776f35b1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/781c6a3ca5b033901bed412a6e104854.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c1e7d86796fa60cfd08eaa0fbfe10a.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eea226f9f1009bbb12bb02e1e76c85dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d532f3da87681659be0fb8fe89f8a8e3.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b61d8c191552ec3a203a1fb838cef02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74a100d401d78914e89031d187db644c.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70261f192395f0c9b26d4e4b422cc25a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c4ad3dabc23a6967c4be7a25dd387c1.png)
复数的结论仍成立的序号是
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解题方法
5 . 我们知道,判断直线与圆的位置关系可以用圆心到直线的距离进行判断,那么直线与椭圆的位置关系有类似的判别方法吗?请同学们进行研究并完成下面问题.
(1)设
、
是椭圆
的两个焦点,点
、
到直线
的距离分别为
、
,试求
的值,并判断直线L与椭圆M的位置关系;
(2)设
、
是椭圆
(
)的两个焦点,点
、
到直线
(m、n不同时为0)的距离分别为
、
,且直线L与椭圆M相切,试求
的值;
(3)试写出一个能判断直线与椭圆的位置关系的充要条件,并证明;
(4)将(3)中得出的结论类比到其他曲线,请同学们给出自己研究的有关结论(不必证明).
(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/870fb1f573acc20477bc0875ee2d47f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57aa8a8c36f02402681caf636bad94ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a1f2f816a51069ca88b1665053c53e.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f326db309ab6bf16acfab03080650c73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44f06e518dda83f3d05f419cf2852380.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a1f2f816a51069ca88b1665053c53e.png)
(3)试写出一个能判断直线与椭圆的位置关系的充要条件,并证明;
(4)将(3)中得出的结论类比到其他曲线,请同学们给出自己研究的有关结论(不必证明).
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6 . 已知n个球面每两个都相交于一圆,问这n个球面把空间分成多少个区域?
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7 . 巴塞尔问题是一个著名的数论问题,这个问题首先由皮耶特罗·门戈利在1644年提出,由欧拉在1735年解决.由于这个问题难倒了以前许多的数学家,欧拉一解出这个问题,马上就出名了,当时他28岁.这个问题是精确计算所有平方数倒数的和,也就是以下级数的和
.巴塞尔问题是寻找这个数的准确值,欧拉发现
的准确值是
.不过遗憾的是:若把上式中的指数
换成其他的数,例如
,则
的精确值为多少,至今未解决.下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88d3e556a769735b41dfdbb5c18f1e7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e1f07a436980c24079d808a9b76c505.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50d60bd6f7ed79d95117a0b881553fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
A.所有正奇数的平方倒数和为![]() |
B.记![]() ![]() ![]() |
C.![]() ![]() |
D.记![]() ![]() ![]() ![]() |
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8 . 王小洁同学将平面直角坐标系
中的椭圆
与圆
进行类比,得到以下四个结论,其中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e48d1edbfb6a5a48f9a95551d1dbc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03441ec2226a7859b2ab0bef6d81a17b.png)
A.若P、Q在![]() ![]() ![]() ![]() |
B.若P、Q在![]() ![]() ![]() |
C.若点![]() ![]() ![]() ![]() |
D.若点![]() ![]() ![]() ![]() |
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9 . 下列类比推理正确的序号为( )
①“边长为
的正三角形内任一点到三边距离之和是定值
”类比空间,“棱长为
的正四面体内任一点到四个面的距离之和是定值
”;
②在平面上,若两个正三角形的边长比为
,则他们的面积比为
.类似的,在空间中,若两个正四面体的棱长比为
,则他们的体积比为
;
③已知椭圆具有性质:若
,
是椭圆上
关于原点对称的两个点,点
是椭圆上任意一点,则当
,
的斜率都存在,
,类似的,点
若在双曲线
上,则
.
④长宽分别为
,
的矩形的外接圆的面积为
,类比空间中,长宽高分别为
,
,
的长方体的外接球的面积为
.
①“边长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5dd988e1c7fcd3cc8526722fede422bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e849d89b9b5ccfc6cda523a364f5642.png)
②在平面上,若两个正三角形的边长比为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa9c934d84feba963335cc7edf01610e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37d65e051e943ab28fa57aee2fb57994.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/765fed228492b11196a8b2bc776a7645.png)
③已知椭圆具有性质:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd54b9df3402ad91e2d34c40efe0c7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be86d360cf391d521c4c31b1f9ce79b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f3fa0b40fb0d9b8c62e37316ab3b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c23f4936c8e2ff75d6f395615e8a599b.png)
④长宽分别为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46d6d3d174c67ab2a4b92df4834ad3e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3e4b7727b2960b51a06fbe3ee522e33.png)
A.①③ | B.②④ | C.①④ | D.②③ |
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解题方法
10 . 已知
,
是椭圆
:
(
)上不同的两点,
为椭圆上异于
,
的点.
(1)证明:若
,
是椭圆
的左、右顶点,则
的斜率与
的斜率之积为定值;
(2)探讨若
,
为椭圆
上关于原点对称的两点,
仍为
上异于
,
的点,若
的斜率和
的斜率都存在,是否仍有(1)中的结论呢?请说明理由;
(3)类比椭圆中的结论,双曲线
:
(
,
)中是否具有类似(1)的结论,若有,写出该定值(不必证明);若没有,请简要说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d7aea48c44781a844b5c19191f70f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0c4c098615c6bc7e6dcf72e5b5201a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
(1)证明:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800c5e266b4ad8462a46970f0a232d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46b053f98b1d05a2043e94eeaefea87.png)
(2)探讨若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/800c5e266b4ad8462a46970f0a232d52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f46b053f98b1d05a2043e94eeaefea87.png)
(3)类比椭圆中的结论,双曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f3fa0b40fb0d9b8c62e37316ab3b04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67ca5fd57c2c2fcc3c7a574fdd1467d9.png)
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