名校
解题方法
1 . 某市政府为了节约生活用水,计划对居民生活用水费用实施阶梯式水价制度,即确定每户月人均用水量标准M(单位:立方米),月人均用水量不超过M的部分按平价收费,超出M的部分按议价收费.现随机抽取200户进行调查,抽取的用户月人均用水量的频率分布直方图如图所示.
(1)求频率分布直方图中
的值;
(2)如果希望
的用户月人均用水量不超过标准M,那么标准M定为多少比较合理?
(3)若从月人均用水量在
,
,
三组的用户中采用按比例分层抽样的方法选取6户参加节水座谈会,再从6户中随机地抽2户发言,求发言的2户来自不同组的概率.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/24/d8bd53bb-4c48-42ab-960c-920d3e6430ea.png?resizew=396)
(1)求频率分布直方图中
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)如果希望
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/358d1067c81a8f997a4d457088a769d5.png)
(3)若从月人均用水量在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0812dccbe77d49bcd049a6f441d34935.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ae223589cabce74b2842d8a8a3732a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce885fa4d62e5e079834554c940d21b.png)
您最近一年使用:0次
2023-06-22更新
|
462次组卷
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4卷引用:浙江省丽水市2022-2023学年高二下学期期末数学试题
浙江省丽水市2022-2023学年高二下学期期末数学试题(已下线)模块四 专题5 暑期结束综合检测5(能力卷)云南省开远市第一中学校2022-2023学年高二下学期6月月考数学试题(已下线)黄金卷08
2 . 已知双曲线
,在双曲线
的右支上存在不同于点
的两点
,
,记直线
的斜率分别为
,且
,
,
成等差数列.
(1)求
的取值范围;
(2)若
的面积为
(
为坐标原点),求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6e92dd981e6ac024897dfac39557ab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1e95fb519f59c46f40e4ab44660073.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31ed47b8230bc383b2c167264f750d70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/595ba5dc88bf92a4d6a32b81ca103f03.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea1f0417d8269f01d8e0bc1a8756e2ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
您最近一年使用:0次
2023-06-17更新
|
864次组卷
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4卷引用:浙江省丽水市2022-2023学年高二上学期期末数学试题
浙江省丽水市2022-2023学年高二上学期期末数学试题江苏省南京市第一中学2023届高三下学期高考适应性考试数学试题山东省招远市第二中学2023-2024学年高二上学期期末模拟数学试题(已下线)每日一题 第20题 最值问题 减元降次(高二)
3 . 已知抛物线
,点
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74bc64a84fffca0bbc246bea0970d8e.png)
,过点
的直线与抛物线
交于
,
两点,AP,AQ分别交抛物线
于
,N两点,
为坐标原点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bb4dd4670828f75bc573b52cdd02e1d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/311497849126f1aaf1da0ec75602eabf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e74bc64a84fffca0bbc246bea0970d8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4d60e12f831245f52296bea1126ba53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.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/1dde8112e8eb968fd042418dd632759e.png)
A.焦点坐标为![]() | B.向量![]() ![]() |
C.直线MN的斜率为![]() | D.若直线PQ过焦点![]() ![]() |
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