1 . 已知正三棱锥P-ABC的底面ABC为正三角形,该正三棱锥的外接球的球心O满足
.则二面角A-PB-C的余弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55dbdf40a17f762188ae27b06bf39f7a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 已知二面角
的大小为30°,则由平面a上的圆在平面
上的正射影得到的椭圆的离心率等于.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754bbd99327195520a4ca3ce3b9a0577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 已知数列
满足
、
、
成等差数列,且对任意的正整数n,均有
,其中,
为数列
的前n项和.求
(1)
、
、
的值;
(2)数列
的通项公式.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d93c1ae7b22099a5d4c1c4241e5ca18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/085b6719600a546261dfeda1098df375.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
(2)数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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4 . 已知复数
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e0aeeb125cfb42e33094594d4381f5.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72c43cac073224f31037f4f0264bea7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e0aeeb125cfb42e33094594d4381f5.png)
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5 . 在矩形ABCD中,AB=3,AD=4,P为矩形ABCD所在平面上一点,满足PA=2,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250638ec12df20f10c5157a3adb79104.png)
____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01510a5e33071204860456f2f3dfcc1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/250638ec12df20f10c5157a3adb79104.png)
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6 . 设素数p满足存在正整数x、y使得
,
,则符合条件的素数p的个数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f3b5800cd542faeeeef074e5eda264.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b7a058009623c32b7545c74c6df81a9.png)
A.1 | B.2 | C.3 | D.4 |
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7 . 已知函数
.
(1)记
,求
在区间
内的最大值与最小值;
(2)求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4792192c5534b1c016777584893d3f86.png)
(1)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72a50aefb46bedc4167616554a16c448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6ec2cae169cca0ee60437a2759ec77a.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8e57262c56dfb0f946341024d82716.png)
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8 . 已知n为正整数,二项式
的展开式中含有
的项,则n的最小值为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b6428af9e6b66e2fb5157e78bc4dd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f61526d17d59d9319fbebcb194da1910.png)
A.4 | B.5 | C.6 | D.7 |
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9 . 已知点P(x、y)满足
.则到x轴的距离
的点P的概率为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fc33e98b55a00b2f208485f0c520f3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d95295f711de2f56a76487a99f4bdd04.png)
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