名校
1 . 已知函数
.
(1)当
时,求
的单调区间;
(2)当
时,
恒成立,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1996957bc581e5d03c0f733233e9956.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b269c11e6f9dbbf1a1efcda572f13ea8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c8abdaf1a883ca6d2fed14f8341696.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2 . 如图所示数阵,第1行为1,从第2行开始,每一行的左右两端都为1,而除1之外的每个数为前一行其上方相邻两个数之和再加1.则第12行的第3个数为______ ;当
时,前n行的所有数之和为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36b98ef143f8159f3a7dafa1fd2f2370.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/30/1160234f-edf4-434b-810b-905fb61b5f57.png?resizew=171)
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3 . 设等差数列
的公差为
,数列
的前
项和为
,若
.
(1)求数列
的通项公式;
(2)若
,求数列
的前
项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4184597c94d1077842234d5f6c1d00a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b7aa11e54f42c1dd643c6820ee54d8f.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d949040e7584edef509f9b54153bd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
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4 . 在
的展开式中,第4项的二项式系数与第3项的二项式系数的比为2∶1.
(1)求n的值;
(2)求展开式中含
的项的二项式系数;(用数字作答)
(3)求值:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e85fddb568952c12b07fbfaf2dcfba38.png)
(1)求n的值;
(2)求展开式中含
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3336c8ed5361c10c37300e41e03f9f2f.png)
(3)求值:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f1fe2a983a43140bb3d2ef7fe297026.png)
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5 . 由四个棱长为1的正方体组合成的正四棱柱
(如图所示),点
是正方形
的中心,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db00203ccba70779c9e2151b43765b92.png)
A.1 | B.2 | C.3 | D.4 |
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6 . 已知随机事件
满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea51e73a63f758010e70f267d2c7570e.png)
_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ae6f48b9a53c0155a692509cf31f7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8686e4bf1ccdeba0e88c476c22857103.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea51e73a63f758010e70f267d2c7570e.png)
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名校
7 . 甲袋中有3个白球和2个红球,乙袋中有2个白球和3个红球,丙袋中有4个白球和n个红球.先随机取一只袋,再从该袋中随机取一个球,该球为红球的概率是
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d86ab7c97cd8a0b15ba5efc1be94230.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
A.2 | B.3 | C.4 | D.5 |
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解题方法
8 . 已知数列
满足
,当
时,有
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/137d52f0d0c570e4d397e1760b3ab575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ea9e6672f9e8ba0383e2463239a472.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
9 . 若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd38362296f86624bdf44f151b24d4ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925d00bf14621e35a95a9f5af83dbfc8.png)
A.45 | B.55 | C.120 | D.165 |
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名校
解题方法
10 . 如图,在斜三棱柱
中,底面
是边长为2的正三角形,
是以
为斜边的等腰直角三角形,点
为
中点,
,点
为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/29/6c33970c-923b-473c-961e-f357ed2982e8.png?resizew=160)
(1)求证:
平面
;
(2)求二面角
的余弦值;
(3)过
作与
垂直的平面
,平面
交直线
于点
,求线段
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52bbed3815301752db129a7435d2e247.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27e34108e9e683f275c5838b0a8bf9fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/5/29/6c33970c-923b-473c-961e-f357ed2982e8.png?resizew=160)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e5981445b6f2a6c58974158d96a4de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea67423ce6963c0972867306169f17a.png)
(3)过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb6ede9761b5b90f8dc137708e1ee90f.png)
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