名校
解题方法
1 . 某企业通过调查问卷的形式对本企业900名员工的工作满意程度进行调查,并随机抽取了其中30名员工(16名女工,14名男工)的得分,如下表:
(1)根据以上数据,估计该企业得分大于45分的员工人数;
(2)现用计算器求得这30名员工的平均得分为40.5分,若规定大于平局得分为 “满意”,否则为 “不满意”,请完成下列表格:
(3)根据上述表中数据,利用独立性检验的方法判断,能否在犯错误的概率不超过1%的前提下,认为该企业员工“性别”与“工作是否满意”有关?
参考数据:
女 | 47 | 36 | 32 | 48 | 34 | 44 | 43 | 47 | 46 | 41 | 43 | 42 | 50 | 43 | 35 | 49 |
男 | 37 | 35 | 34 | 43 | 46 | 36 | 38 | 40 | 39 | 32 | 48 | 33 | 40 | 34 |
(2)现用计算器求得这30名员工的平均得分为40.5分,若规定大于平局得分为 “满意”,否则为 “不满意”,请完成下列表格:
“满意”的人数 | “不满意”的人数 | 合计 | |
女员工 | 16 | ||
男员工 | 14 | ||
合计 | 30 |
参考数据:
P(K2![]() | 0.10 | 0.050 | 0.025 | 0.010 | 0.001 |
K | 2.706 | 3.841 | 5.024 | 6.635 | 10.828 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e3821f70c08c5180e9b3086d3c9610f.png)
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7卷引用:专题8.8 成对数据的统计分析全章综合测试卷(提高篇)-2023-2024学年高二数学举一反三系列(人教A版2019选择性必修第三册)
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2 . (本小题满分
分)已知圆
有以下性质:
①过圆
上一点
的圆的切线方程是
.
②若
为圆
外一点,过
作圆
的两条切线,切点分别为
,则直线
的方程为
.
③若不在坐标轴上的点
为圆
外一点,过
作圆
的两条切线,切点分别为
,则
垂直
,即
,且
平分线段
.
(1)类比上述有关结论,猜想过椭圆
上一点
的切线方程(不要求证明);
(2)过椭圆
外一点
作两直线,与椭圆相切于
两点,求过
两点的直线方程;
(3)若过椭圆
外一点
(
不在坐标轴上)作两直线,与椭圆相切于
两点,求证:
为定值,且
平分线段
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e78c013cb4fc61193b651072d5e15de4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/912472896921b0ab079ac985f40c059e.png)
①过圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243b39884bbcaf3c1986f1e2e9854034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/514f5852467af91dbd5afed62095ed3f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243b39884bbcaf3c1986f1e2e9854034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae1567d8f98fabc1a3948f8602cc5e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/514f5852467af91dbd5afed62095ed3f.png)
③若不在坐标轴上的点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243b39884bbcaf3c1986f1e2e9854034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae1567d8f98fabc1a3948f8602cc5e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a0397c811fe80c80ecd5b871201987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1badddf118f1d9174f687c24181d4759.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a0397c811fe80c80ecd5b871201987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
(1)类比上述有关结论,猜想过椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4338f291d685a5bb24c7997b07dbb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243b39884bbcaf3c1986f1e2e9854034.png)
(2)过椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4338f291d685a5bb24c7997b07dbb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243b39884bbcaf3c1986f1e2e9854034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae1567d8f98fabc1a3948f8602cc5e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae1567d8f98fabc1a3948f8602cc5e7.png)
(3)若过椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4338f291d685a5bb24c7997b07dbb80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/243b39884bbcaf3c1986f1e2e9854034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ae1567d8f98fabc1a3948f8602cc5e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10aa960f766842c9899bc7943a70ed91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a0397c811fe80c80ecd5b871201987.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
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3卷引用:大招16极点极线
3 . 已知
是由非负整数组成的无穷数列,该数列前n项的最大值记为
,第n项之后各项
,
…的最小值记为
,
.
(1)若
为2,1,4,3,2,1,4,3…,是一个周期为4的数列(即对任意n∈N*,
),写出
的值;
(2)设d为非负整数,证明:
(n=1,2,3…)的充分必要条件为
为公差为d的等差数列;
(3)证明:若
,
(n=1,2,3…),则
的项只能是1或2,且有无穷多项为1.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/090426eb29836bc30c006b3739c08057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39222f0687c9124bddb35544bcc7798.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f5c583c98a1fd516c6ceaa60b55dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8c4312e4b482794178f8b34e61a1302.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a662a381e0867ce9d871c7a8e71f0d37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07ed9fa2d3ae8c7d15b7da794aff4c62.png)
(2)设d为非负整数,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/318108e4221f00c6d3256751df684a18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)证明:若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f99489791db717b082bd96abb88c55e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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