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1 . 在
中,
,
,点
是边
的中点,点
为线段
的中点,则
的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c974c20de0e31685d64e26522969e2f.png)
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2 . 如图,正方体
的棱长为2,E是棱
的中点,
是侧面
上的动点,且满足
平面
,则下列结论中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82b724168afaee2ecddf97257180be18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1df970d8b2fcbb38bfac1dc33da9179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923189afc198d153c79059a827f63c87.png)
A.直线![]() ![]() ![]() |
B.存在点![]() ![]() |
C.平面![]() ![]() |
D.平面![]() ![]() ![]() |
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解题方法
3 . 已知函数
的导函数为
,且
,当
时,
,则不等式
的解集为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a4b04824a308519a61318a82aa97a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e91770acb583f05c3ead767d247be034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d09afb1e101b1556179200f9a59d23a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f12e34de335c69e51876e9447659aa40.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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4 . 已知 ,则
( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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5 . 已知椭圆![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5bbb709522dba9425a6b45ee671298.png)
长半轴长为
,离心率为
,过左焦点
作斜率为
的直线与椭圆交于
,
两点,且
.
(1)求椭圆方程;
(2)求直线
的方程;
(3)若点
位于直线的
左侧且为椭圆上一点,点
关于点
的对称点为
,设直线
,
的交点为
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a5bbb709522dba9425a6b45ee671298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48da128547c4cf9745e8e4b99988a3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/893d4e8d70ea2c716ac7b6c1777a77f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37eac93736b605958ab6834b255dfa8b.png)
(1)求椭圆方程;
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(3)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f7ad41b36674fd6e90176ee24cdefbb.png)
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6 . 已知抛物线C:
,过点
的直线与抛物线交于
,
两点,O为坐标原点,抛物线的焦点为F,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/745de5ef1fd897d16e37464172d5e8c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f2a72c6d7780757ab065fb29f47526.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ff82ebdfad5e7de1c7487b0b817a7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a53e311ee0b5085e7e5a45c606daa5d.png)
A.![]() | B.点T与抛物线上任意一点的最短距离为4 |
C.![]() | D.![]() |
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7 . 已知函数
.
(1)若
在
处的切线与y轴垂直,求a的值;
(2)若
恒成立,求a的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/186a0cde824a54062d1c275df23a40be.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b384412acba251d87902ab928902f16.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22e38c541dec8fce1d26886e5ef7d21f.png)
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8 . 甲、乙两人进行
局羽毛球比赛(无平局),每局甲获胜的概率均为
,规定:比赛结束时获胜局数多的人赢得比赛,记甲赢得比赛的概率为
,假设每局比赛互不影响,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000963f814cc6e73dd5f04fbb3b684a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6291d7b91f71daa0b3c4fa02dc7a5ea.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
9 . 现有编号为Ⅰ,Ⅱ,Ⅲ的3个盒子,Ⅰ号盒中有2个白球和3个黑球;Ⅱ号盒中有2个白球和2个黑球;Ⅲ盒中有3个白球和1个黑球.现从Ⅰ号盒中任取1个球放入Ⅱ号盒中,再从Ⅱ号盒中任取1个球放入Ⅲ号盒中,最后从Ⅲ号盒中任取1个球放回Ⅰ号盒中.
(1)求3个盒子的球的组成都保持不变的概率;
(2)问Ⅰ号盒中的球怎样组成的可能性最大?
(1)求3个盒子的球的组成都保持不变的概率;
(2)问Ⅰ号盒中的球怎样组成的可能性最大?
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10 . 甲、乙两名运动员进行乒乓球比赛,规定每局比赛胜者得1分,负者得0分,比赛一直进行到一方比另一方多两分为止,多得两分的一方赢得比赛.已知每局比赛中,甲获胜的概率为
,乙获胜的概率为
,
,且每局比赛结果相互独立.
①若
,则甲运动员恰好在第4局比赛后赢得比赛的概率为____________ ;
②若比赛最多进行5局,则比赛结束时比赛局数
的期望
的最大值为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f92b7bb58207fc4cf8e6abb6f0fd5e.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c673f3acf403e7c300232d392e514261.png)
②若比赛最多进行5局,则比赛结束时比赛局数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf3baba074e8aeb6f3ea117865bbd1b.png)
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