1 . 将数列
和
的公共项从小到大排列得到数列
,记
的前
项和为
.
(1)求
的通项公式;
(2)求使得
的
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b3b236ce5ac46bf29625249180af284.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33a023e8c7e533834a3a00f6113eea60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/6a3f1f8813adcedd56b471961b2ad6a6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade47598510917b18557339027024b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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2 . 记
的内角A,B,C的对边分别为a,b,c,已知
.
(1)求A;
(2)若
,角A的平分线交BC于点D,求AD;
(3)若
的面积为
,求a的最小值;
(4)若BC边上的中线长为
,且
的外接圆半径为
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b11d83cc4abd3886788064b177a46c4.png)
(1)求A;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dd9cc29b4246a34c2d3700c97bd664.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e162b98c280720fcb909cf392fda3.png)
(4)若BC边上的中线长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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3 . 某科研院校培育橘树新品种,经统计,单个果品的质量
(单位:g)近似服从正态分布
,且
,则在1000个橘果中,估计单个果品质量不低于94g的橘果个数为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f230da6e1c3366909b743a9858a59c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f6be127d3eb215ec9e5371479360828.png)
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解题方法
4 . 某社区为奖励参加过社区举办的“我劳动,我光荣”公益性志愿活动的中小学生,举办了一场回馈志愿者福利活动,活动规则为:箱子中装有大小质地完全相同且标有
的小球,从中任意抽取4个,凡选出的4个号码中含有1个或1个以上基本号码就能中奖(基本号码为
),根据基本号码个数的多少中奖的等级分为三等奖,二等奖,一等奖和特等奖,其所对应选中的基本号码个数分别为
.若小明是该社区的其中一名志愿者,并参加了本次回馈活动,据此回答下列问题:
(1)求小明在此次活动中至少中二等奖的概率;
(2)若三等奖,二等奖,一等奖,特等奖的奖金分别为495元,990元,1485元,b元,且小明在此次活动中获得的奖金数的期望
(X表示在一次抽取中所获的奖金数),则特等奖的奖金为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d6e08d8905f2ebc148cfe6ac91e16f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2e285e39b8ebeafcc054864b351e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66265fdf44defb54192cecb9349a26b4.png)
(1)求小明在此次活动中至少中二等奖的概率;
(2)若三等奖,二等奖,一等奖,特等奖的奖金分别为495元,990元,1485元,b元,且小明在此次活动中获得的奖金数的期望
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92f1aa723b8ea7fc25f1a02f7c99fbbf.png)
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解题方法
5 . 已知四棱锥
,底面
为矩形,且
平面
,
,
分别为棱
的中点,则下列选项正确的是( )
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af0788c2784a2c5bb9f47ffef6902f18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930e85bc9f73e86cfb6ce9b076433f1b.png)
A.![]() ![]() | B.![]() ![]() |
C.平面![]() ![]() | D.平面![]() ![]() |
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6 . 已知正三棱锥的底面边长为4,侧棱长为8,则三棱锥的体积为( )
A.![]() | B.![]() | C.![]() | D.![]() |
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解题方法
7 . 已知函数
是定义在
上的奇函数,满足
,当
时,有
.
(1)求函数
的解析式;
(2)判断
的单调性,并证明;
(3)解不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8b61bb7cb94b4d06f0090df1e365667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34f2ef95d5254995f52a67c732b51243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c173aa8c841859aa2067c93949a948bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf93c790b9bdd806b63fa305205ee30b.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(3)解不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61243df693bed5c1b686044aba21a1f5.png)
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解题方法
8 . 定义在
上的偶函数
满足
,
时
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7a12ea80e65af42940225abbdb17881.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54297d09c19f29d92463d21928998266.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b1c079afd1b058adc67a50f48f3d466.png)
A.![]() |
B.![]() |
C.![]() ![]() ![]() |
D.若![]() ![]() ![]() |
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9 . 已知函数
(e为自然对数的底数),且
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450a0d98df0084f3519d02805fb7ad56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee14240604cfac93453bddcebb8ee4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2796868fcd26d2a8558666fe46494541.png)
A.2024 | B.![]() | C.2022 | D.![]() |
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10 . 已知函数
.
(1)求
的最小正周期及单调递增区间;
(2)若
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f354c32853756b9b97a0d278c258b5c4.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51a5ccb32601d98986679e94ab280cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c5a05a11f731194a845e68a0479ce4.png)
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