名校
解题方法
1 . 设函数
.
(1)求函数
在
上的最小值点;
(2)若
,求证:
是函数
在
时单调递增的充分不必要条件.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047bd5496f9e789d154ff1d4091bc37d.png)
(1)求函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86f8b396f2ae63e79ffd8886ae4d3849.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d32ecd3f28e50342a08d0673f69befc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce3a34d6f60032718820c3da2b07786b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1938c093dd2fbcb752d0eb7a18d143b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1864b98153200f5929787295de2c1e38.png)
您最近一年使用:0次
名校
解题方法
2 . 设椭圆
的左、右焦点分别为
、
,上顶点为
,在
轴负半轴上有一点
,满足
为线段
的中点,且
.
(1)求椭圆
的离心率;
(2)若过
、
、
三点的圆与直线
相切,求椭圆
的方程;
(3)在(2)的条件下,过右焦点
作斜率为
的直线与椭圆
交于
、
两点,在
轴上是否存在点
使得以
、
为邻边的平行四边形是菱形?如果存在,求出
的取值范围,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851a5d6ec23256f9b4a9e98aa92945fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3656055f5256cd06e636ea96e9f89c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b8174c73ce27865ba2ec48d337be275.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)若过
![](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/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dec7b952777ec781a1a13a356b95e53a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(3)在(2)的条件下,过右焦点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84bfec4efcc9f0e656d6864daaaef55d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c8ffe24cf9f327aeb241225ab15ab1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
名校
3 . 对于
,若数列
满足
,则称这个数列为“
数列”.
(1)已知数列1,
,
是“
数列”,求实数m的取值范围;
(2)是否存在首项为
的等差数列
为“
数列”,且其前n项和
使得
恒成立?若存在,求出
的通项公式;若不存在,请说明理由;
(3)已知各项均为正整数的等比数列
是“
数列”,数列
不是“
数列”,若
,试判断数列
是否为“
数列”,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d12d0bd9afdd4e53ff37f5bfcaa1106c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1fd18a909cecbaee7115d6b15631d83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdb5679fa7c34fc2235d2a54d189cfbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
(1)已知数列1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0623207595425920f16e76a7f8f268b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8d7b4bb12628d5ed455d814b8aafa1f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
(2)是否存在首项为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acbc6a613224461ade69362d46550474.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4721c1fc0aa816297784fc1adb606829.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
(3)已知各项均为正整数的等比数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/205da0adbd75c2012ae402852fde723e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/880002f19232d64ec0974a0552527ecb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
您最近一年使用:0次
2020-10-21更新
|
892次组卷
|
15卷引用:2016-2017学年北京市丰台区高三想上学期一模练习理数试卷
2016-2017学年北京市丰台区高三想上学期一模练习理数试卷2018届北京市北京101中学3月份高三理零模试卷河北省定州中学2018届高三下学期第一次月考数学试题1江苏省淮安六校联盟2019-2020学年高三年级第三次学情调查理科数学试题2020届江苏省南京市中华中学高三下学期阶段考试数学试题北京交通大学附属中学2022届高三12月月考数学试题北京海淀教师进修学校附属实验学校2016-2017学年高一下学期期中考试数学试题江苏省盐城市第一中学2020届高三下学期6月第二次调研考试数学试题(已下线)专题20 数列的综合-2020年高考数学母题题源解密(江苏专版)北京市房山区2024届高三上学期入学统练数学试题重庆市涪陵第五中学校2024届高三第一次适应性考试数学试题江苏省淮安市淮阴中学2019-2020学年高一下学期期末数学试题湖北省武汉市五校联合体2019-2020学年高一下学期期末数学试题广东省广州市玉岩中学2023-2024学年高三下学期开学考数学试卷(已下线)微考点4-1 新高考新试卷结构压轴题新定义数列试题分类汇编
4 . 已知数列
:
,
,
,…,
为1,2,3,…,
的一个排列,若
互不相同,则称数列
具有性质
.
(1)若
,且
,写出具有性质
的所有数列
;
(2)若数列
具有性质
,证明:
;
(3)当
时,分别判断是否存在具有性质
的数列
?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8441be3658ffea9c5fd8b10cf0118ab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46c9ba6ba7e74aec6676656172e9739e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fac3649308b528fd56545ba102dc42d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fc336b4a83bf6d66c4afcc431597f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc388ca954a8b9fd8075ce3fa943f9fa.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87e0865b370c0a1ef6a30eca0c0595f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
您最近一年使用:0次
名校
解题方法
5 . 已知椭圆
:
与
轴交于
,
两点,
为椭圆
的左焦点,且
是边长为2的等边三角形.
(1)求椭圆
的方程;
(2)设过点
的直线与椭圆
交于不同的两点
,
,点
关于
轴的对称点为
(
与
,
都不重合),判断直线
与
轴是否交于一个定点?若是,请写出定点坐标,并证明你的结论;若不是,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eed6b9540857e386651e191a0a5b5a98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a71fc9c0068109dad1382354570665.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7352dbf2e0740056910e7721bd420d2a.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72480c8fae3dc057229a7958e9daed74.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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.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/ea68142955809f9f40b15e3fa0f5bdd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
名校
6 . 已知函数
.
(1)若函数
的最小值为0,求
的值;
(2)设
,求函数
的单调区间;
(3)设函数
与函数
的图像的一个公共点为
,若过点
有且仅有一条公切线,求点
的坐标及实数
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/505ce442f4fc22b7e927ae7fcdb4f215.png)
(1)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13f2e718b64299afc9e39b917525a143.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31b210578dd519049e4105e1405bfd7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
(3)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/059b5426484fd05ae7e5c037e9e1706b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
名校
解题方法
7 . 如图所示,在四棱锥
中,底面四边形
为正方形,已知
平面
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/12b2f808-0347-417c-ab08-4b11783c2eaf.png?resizew=133)
(1)证明:
;
(2)求
与平面
所成角的正弦值;
(3)在棱
上是否存在一点
,使得平面
平面
?若存在,求
的值并证明,若不存在,说明理由.
![](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/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364d6c88726d8c3bb8ed297057332bac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/12b2f808-0347-417c-ab08-4b11783c2eaf.png?resizew=133)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb5d56d8170b764b80a672cd6c861921.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f571a1aac46c6d0cf440c0ec2846bf9.png)
(3)在棱
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3547a914468b082d8d8741b974a03190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c54d01623f09f23103f03ba1135fc6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/add47889f6b4911133999a898d3666d3.png)
您最近一年使用:0次
2020-02-15更新
|
834次组卷
|
2卷引用:2020届北京市西城区师范大学附属实验中学高三摸底数学试题
名校
解题方法
8 . 已知
为函数
的极值点.
(1)求
的值;
(2)设函数
,若对
,
,使得
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9832557d030484b24831b127c15bd53.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f74a31e333b5398831fdd445da04e07.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(2)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c05ca2670d9641d61aa1a73303c35467.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372e0890a16df97fc45675285f176033.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7898341abbbf8da0a085fa59d0887576.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edbb2e0f03c082ff5aba58fe7ecc92eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
名校
解题方法
9 . 设椭圆
的左、右焦点分别为
,
,离心率为
,过点
的直线
交椭圆
于点
,
(不与左右顶点重合),连接![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f2b5b1e9ef7dd60486b550eb4cbec1.png)
,已知
的周长为8.
(1)求椭圆
的方程;
(2)设
,若
,求直线
的方程.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad523e69a1bf925e73a22900b9855df2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3fb78c5f885034612c0e030b920143d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5076289823db419f94e9c0c8f4aafd9.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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7f2b5b1e9ef7dd60486b550eb4cbec1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c429b542abf0ebee74a239b4857cf88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5e56b5cbcf69756792fc934bcc20cb.png)
(1)求椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdbafce15aac1792cf50f4edd96f2764.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8dd9f4587da6bc3f563674af1413f85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
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解题方法
10 . 某公司打算引进一台设备使用一年,现有甲、乙两种设备可供选择.甲设备每台10000元,乙设备每台9000元.此外设备使用期间还需维修,对于每台设备,一年间三次及三次以内免费维修,三次以外的维修费用均为每次1000元.该公司统计了曾使用过的甲、乙各50台设备在一年间的维修次数,得到下面的频数分布表,以这两种设备分别在50台中的维修次数频率代替维修次数发生的概率.
(1)设甲、乙两种设备每台购买和一年间维修的花费总额分别为
和
,求
和
的分布列;
(2)若以数学期望为决策依据,希望设备购买和一年间维修的花费总额尽量低,且维修次数尽量少,则需要购买哪种设备?请说明理由.
维修次数 | 2 | 3 | 4 | 5 | 6 |
甲设备 | 5 | 10 | 30 | 5 | 0 |
乙设备 | 0 | 5 | 15 | 15 | 15 |
![](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)
(2)若以数学期望为决策依据,希望设备购买和一年间维修的花费总额尽量低,且维修次数尽量少,则需要购买哪种设备?请说明理由.
您最近一年使用:0次
2020-02-15更新
|
1933次组卷
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8卷引用:2020届北京市西城区师范大学附属实验中学高三摸底数学试题
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