1 . 某企业用自动化流水线生产统一规格的产品,每天上午的四个小时开工期间,每隔
分钟抽取一件产品作为样本,则这样的抽样方法是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
A.简单随机抽样 | B.系统抽样 | C.分层抽样 | D.以上三种方法都有 |
您最近一年使用:0次
2020-09-14更新
|
304次组卷
|
3卷引用:2020届山西省临汾市高三高考考前适应性训练(三)数学(理)试题
2020届山西省临汾市高三高考考前适应性训练(三)数学(理)试题陕西省延安市吴起高级中学2019-2020学年高一下学期第四次质量检测(期末)数学试题(已下线)专题11 统计-备战2021年高考数学(理)纠错笔记
名校
2 . 下列函数既是偶函数,又在
上单调递增的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ab5e0524def52baf53480b8726784ed.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2020-08-28更新
|
590次组卷
|
14卷引用:2020届山西省临汾市高三高考考前适应性训练(三)数学(理)试题
2020届山西省临汾市高三高考考前适应性训练(三)数学(理)试题宁夏青铜峡市高级中学(吴忠中学青铜峡分校)2019-2020学年高二下学期期末考试数学(文)试题内蒙古开鲁县第一中学2019-2020学年高一下学期期末考试数学(文)试题(已下线)专题3.3幂函数(A卷基础篇)-2020-2021学年高一数学必修一同步单元AB卷(人教A版浙江专用)(已下线)专题10 函数的奇偶性的应用-2020年高考数学(文)母题题源解密(全国Ⅱ专版)(已下线)专题09 函数的奇偶性的应用-2020年高考数学(理)母题题源解密(全国Ⅱ专版)(已下线)专题3.4 幂函数(练)-2021年新高考数学一轮复习讲练测(已下线)第3节+幂函数-2020-2021学年高一数学课时同步练(新教材人教A版必修第一册)(已下线)考点05 函数的基本性质-备战2021年高考数学(文)一轮复习考点一遍过(已下线)考点06 二次函数与幂函数-2021年新高考数学一轮复习考点扫描(已下线)考点05 函数的基本性质-备战2021年高考数学(理)一轮复习考点一遍过广西河池市九校2020-2021学年高一下学期第二次联考数学试题(已下线)3.3 幂函数-2021-2022学年高一数学上学期同步课堂习题测试(人教A版2019必修第一册)(已下线)艺体生一轮复习 第三章 函数与导数 第11讲 函数的奇偶性与周期性【练】
3 . 已知椭圆
的左,右焦点分别为
,若
上的点
到
的距离为
,则△
的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/562f2f01c954975a75d579935c6fa6f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d2a97987f71835f519b462f5b8f5957.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0530e3288e75edc196427ebc1448f201.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
4 . 关于函数
,有下述四个结论:
①
是周期为
的函数;
②
在
单调递增;
③
在
上有三个零点;
④
的值域是
.
其中所有正确结论的编号是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa3adcbfbbf45507a5b22b520b8cc86b.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e9fdc1f8ed0ae44b54a9a2a3aca2db4.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c9aeed3c8c5a04e48d011c607f9142.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aebb9595cfebe608e2b3ec06c10421dd.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d188ec2580e273ce87e51653a2177ee.png)
其中所有正确结论的编号是( )
A.②③ | B.①③ | C.①③④ | D.①②④ |
您最近一年使用:0次
2020-06-26更新
|
350次组卷
|
2卷引用:2020届山西省临汾市高三高考考前适应性训练(三)数学(理)试题
解题方法
5 . 已知向量
,向量
在向量
方向上的投影为
.若
,则实数
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45932dc36b77e3c1b06fefdf1243ebdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae98586d80f892771c90ab39eaced90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee437e6ff470c2f67b8429f57b90ae37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a9dc37509f01c2606fb3086a46f4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca54c923d22ca8c8555c5b47e1d661b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
6 . 已知不等式
与不等式
的解集相同.
(1)求
;
(2)若
,且
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6744490daea1bd5659e8ee9f51259f84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d80edca8159a3f2c5c2462300e590690.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72850427e83ff19a24305783e080b280.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6058a6f6881359e7ce8ddefb13c0ae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c21604621e04db26f355875ed4bb557e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3dd4067a19eeb07474557fe7b2508880.png)
您最近一年使用:0次
7 . 在直角坐标系
中,直线
过原点且倾斜角为
,曲线
的参数方程为
(
为参数),曲线
的参数方程为
(
为参数).
(1)求直线
的极坐标方程,曲线
和曲线
的普通方程;
(2)若直线
与曲线
和曲线
在第一象限的交点分别为
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9955b5aebb73cd84447e8541f901ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dadca2f308ede855eb1e25955ade087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b56afa1c7210db1f37132dd9e206c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b5858ee1ce52b251816757257a11c29.png)
(1)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1241216f3c1cb5e73043dd1037f556d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f3ffe7abc59e2f65d827c8eab8d36a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/084cf5ffced059f5653ee2a1023518b7.png)
您最近一年使用:0次
8 . 已知函数
.
(1)讨论
的单调性;
(2)设
,
,
,
是曲线
上任意三点,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6ae3a06e2db61ce958f143eb7f7390b.png)
(1)讨论
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a3efb79f35db8448f3391252ab7d4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8df332f01628130c084fd46aaca0a4b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c16dac1e9bf5804c8907cbc59014d04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c06ceee2b1e227de025476eee95672.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aec64971ce081682c67ad33b4fad90a.png)
您最近一年使用:0次
解题方法
9 . 已知抛物线
,与圆
有且只有两个公共点.
(1)求抛物线
的方程;
(2)经过
的动直线
与抛物线
交于
两点,试问在直线
上是否存在定点
,使得直线
的斜率之和为直线
斜率的
倍?若存在,求出定点
;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8594ef04ed2c9f3e19b05f2650d7733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d497193fdbe50611befb6b3c49de670.png)
(1)求抛物线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35366652793f9994cc34b40d9d9af59a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/107babba45f110012183dc4dc54490f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec56d586906ebaaa3c32c85a415f4c69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe1a6ce0b35896c8a1c687a4376e71f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
您最近一年使用:0次
解题方法
10 . 今年情况特殊,小王在居家自我隔离时对周边的水产养殖产业进行了研究.
、
两个投资项目的利润率分别为投资变量
和
.根据市场分析,
和
的分布列分别为:
(1)若在
两个项目上各投资
万元,
和
分别表示投资项目
和
所获得的利润,求方差
,
;
(2)若在
两个项目上共投资
万元,那么如何分配,能使投资
项目所得利润的方差与投资
项目所得利润的方差的和最小,最小值是多少?
(注:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a829fdd8ec0f3b7ede883cf2c3e53b.png)
![]() | 5% | 10% |
![]() | 0.8 | 0.2 |
![]() | 2% | 8% | 12% |
![]() | 0.2 | 0.5 | 0.3 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5c1116ce7f5a1a7b57517276d5092fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e006432be27a365b8ea6f1c4f835cbdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b4c6f25bc48add17c940a2a5b413bd1.png)
(2)若在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90dd550e1ad9bbf01687ffb4aab788ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(注:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f6717b70ba30be5caf03e9674d1031.png)
您最近一年使用:0次