1 . 在
的展开式中,
的系数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adc0e295197c6b8d9cae510b9fd3a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f15ba1f1f797b12d77a3401dd2120123.png)
A.200 | B.180 | C.150 | D.120 |
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2 . 已知随机变量
的分布列如图:若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/375ed463ded772dc93b8c31ad0032b5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e6b613b885d25be33b2e7fd2f33c15.png)
0 | 1 | ||
A.![]() | B.![]() | C.![]() ![]() | D.![]() ![]() |
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3 . 袋中装有标号为1,2,3,4,5且质地、大小相同的5个小球,从袋子中一次性摸出两个球,记下号码并放回,如果两个号码的和是偶数,则获奖.若有4人参与摸球,则恰好2人获奖的概率是( )
A.![]() | B.![]() | C.![]() | D.![]() |
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4 . 如图,三棱锥
C中,PA,PB,PC两两垂直,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc2aaed1e9ead175f30f7130569d0411.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbda0c56ebe2562f4c341c58126bc311.png)
A.![]() |
B.三棱锥![]() ![]() |
C.点P到平面ABC的距离为![]() |
D.三棱锥![]() ![]() |
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5 . 已知圆C:
,
,若C上存在点P,使得
,则r的取值范围为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e0b279971d9eb13c7e78a3efaed8b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61b5e26e12566b5845e275f5e83cae99.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/007133a2ea0bfba50280741407cf10d4.png)
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6 . 在
中,角A,B,C所对的边分别为a,b,c,下列命题正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.若![]() ![]() ![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.若![]() ![]() ![]() ![]() ![]() |
D.若![]() ![]() |
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7 . 已知函数
.
(1)若曲线
在点
处的切线斜率为3,求a的值;
(2)若
存在单调增区间,求a的取值范围;
(3)是否存在实数
,使得方程
在区间
内有且只有两个不相等的实数根?若存在,求出a的取值范围?若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27b1fb4f45e69862bd6aba8dd9530bc0.png)
(1)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bea9227dd0104da58e0c40952cc87ed.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bca4be345087f993a4078e16c16608e2.png)
(3)是否存在实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30df2c682a8e542dbf20b1e558f7b48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe5239e374894f95da60c5cb35a2a718.png)
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8 . 如图,在四棱锥
中,四边形
为直角梯形,
,
为等边三角形,F为线段
的中点,平面
平面
为线段
上一点.
;
(2)当
为何值时,直线
与平面
夹角的正弦值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3cc99dbf17e39d8603f484fdb1fa009d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d370573f2038efc27eddc6a79b18d67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d349fe863291b79f668a038ec1fc41e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d11e19c84255eb0431415c2dec553d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb26d84907c923278ac4626a9d58947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13508fdc9e840fe612431360a6d451ee.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059d02ae074c7c2f7dfde8058dfa55ab.png)
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9 . 已知
是定义在区间
上的增函数,且
,如果
满足
,则
的取值范围为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d562dc22dfb3b81d0c3f88b54d063c2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58edd6b04c5692e26327f783aea357e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7efbe2451f4f34eef70ea87beef671.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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10 . 已知函数
为奇函数,且
,当
时,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c09c5c89b0c2a92f8c4b70e69b0eada.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c6fd660dd8bdcb76921fd72436d8f5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f7dbb416ec1ff1984a724a4f48bf692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4e0015bbadab05308e3de499b37799.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() | D.![]() |
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