名校
1 . 已知函数
,当______ 时(从①②③④中选出一个作为条件),函数有______ .(从⑤⑥⑦⑧中选出相应的作为结论,只填出一组 即可)
①
②
③
,
④
,
或
⑤4个极小值点⑥1个极小值点⑦6个零点⑧4个零点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f28661fc41284c86b684687cca83dc3b.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e5bcfb3bafe8373dd907e0e55d08f8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ec87fbbb58af2ede93066718daedbff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa1a50afa595bc31a1dbca3ee5fc9dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5957910662949c4f1073155e90852bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143b917df0520097be222accbddf9394.png)
您最近一年使用:0次
2020-03-20更新
|
827次组卷
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3卷引用:2020届东北三省三校哈尔滨师大附中、东北师大附中、辽宁省实验中学高三第一次联合模拟考试理科数学试题
2020届东北三省三校哈尔滨师大附中、东北师大附中、辽宁省实验中学高三第一次联合模拟考试理科数学试题(已下线)冲刺卷01-决战2020年高考数学冲刺卷(山东专版)河北省衡水中学2019-2020学年高三下学期期中数学(理)试题
2 . 某工厂打算设计一种容积为2m3的密闭容器用于贮藏原料,容器的形状是如图所示的直四棱柱,其底面是边长为x米的正方形,假设该容器的底面及侧壁的厚度均可忽略不计.
![](https://img.xkw.com/dksih/QBM/2020/3/17/2421472416120832/2424218160152576/STEM/4b7ade1c0b20487da9ff30fef95dd52e.png?resizew=121)
(1)请你确定x的值,使得该容器的外表面积最小;
(2)若该容器全部由某种每平方米价格为100元的材料做成,且制作该容器仅需将购置的材料做成符合需要的矩形,这些矩形即是直四棱柱形容器的上下底面和侧面(假设这一过程中产生的费用和材料损耗可忽略不计),再将这些上下底面和侧面的边缘进行焊接即可做成该容器,焊接费用是每米500元,试确定x的值,使得生产每个该种容器的成本(即原料购置成本+焊接费用)最低.
![](https://img.xkw.com/dksih/QBM/2020/3/17/2421472416120832/2424218160152576/STEM/4b7ade1c0b20487da9ff30fef95dd52e.png?resizew=121)
(1)请你确定x的值,使得该容器的外表面积最小;
(2)若该容器全部由某种每平方米价格为100元的材料做成,且制作该容器仅需将购置的材料做成符合需要的矩形,这些矩形即是直四棱柱形容器的上下底面和侧面(假设这一过程中产生的费用和材料损耗可忽略不计),再将这些上下底面和侧面的边缘进行焊接即可做成该容器,焊接费用是每米500元,试确定x的值,使得生产每个该种容器的成本(即原料购置成本+焊接费用)最低.
您最近一年使用:0次
3 . 已知函数f(x)是R上的可导函数,且f′(x)=1+cosx,则函数f(x)的解析式可以为_____ .(只须写出一个符合题意的函数解析式即可)
您最近一年使用:0次
4 . 某企业为确定下一年投入某种产品的研发费用,需了解年研发费用
(单位:千万元)对年销售量
(单位:千万件)的影响,统计了近10年投入的年研发费用
与年销售量
(
)的数据,得到散点图如图所示:
![](https://img.xkw.com/dksih/QBM/2021/7/20/2768244514111488/2789449267535872/STEM/286fa41b-ef50-4363-aac4-a1e784832aba.png?resizew=408)
(1)利用散点图判断,
和
(其中
,
为大于0的常数)哪一个更适合作为年研发费用
和年销售量
的回归方程类型(只要给出判断即可,不必说明理由).
(2)对数据作出如下处理:令
,
,得到相关统计量的值如下表:
根据(1)的判断结果及表中数据,求
关于
的回归方程;
(3)已知企业年利润
(单位:千万元)与
,
的关系为
(其中
),根据(2)的结果,要使得该企业下一年的年利润最大,预计下一年应投入多少研发费用?
附:对于一组数据
,
,
,
,其回归直线
的斜率和截距的最小二乘估计分别为
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ea8f47d8d8d9e1832d52b1c7425450.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f70e0635d74c877367a9d586e462ef35.png)
![](https://img.xkw.com/dksih/QBM/2021/7/20/2768244514111488/2789449267535872/STEM/286fa41b-ef50-4363-aac4-a1e784832aba.png?resizew=408)
(1)利用散点图判断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5b1c19e4c57f1d259f8269e551c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba7c4f1ac6cc57f6c5084479badd1f71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
(2)对数据作出如下处理:令
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90229c4f76db5de308cf8d5fc382099b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53c26fa1e573812fab6a173a4eb0ed38.png)
![]() | ![]() | ![]() | ![]() |
![]() | ![]() | ![]() | ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)已知企业年利润
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e81e59019989b7dc2fb59b037ef6e010.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f66d3a55ac5924f52fefff6c450b267.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2beb22b735da7cb8054dd722450632f5.png)
附:对于一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1c6aadc0129bf86f4fff9dcfb924b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/154100371e025fffe0ffae8be9567383.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37e5531913e2f170465d8df01795cd51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a14e40329de36fc4a1a3f8fbfafda12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0943f70585435955d528325e51ef013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d4301d6a4e03a2b43ed6a4c75c783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4df06e95d5bd8a3b15d1e0e995c05eb8.png)
您最近一年使用:0次
2021-08-19更新
|
1074次组卷
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4卷引用:【市级联考】福建省厦门市2019届高中毕业班第一次(3月)质量检查数学(文科 )试题
名校
解题方法
5 . 从
年底开始,非洲东部的肯尼亚等国家爆发出了一场严重的蝗虫灾情.目前,蝗虫已抵达乌干达和坦桑尼亚,并向西亚和南亚等地区蔓延.蝗虫危害大,主要危害禾本科植物,能对农作物造成严重伤害,每只蝗虫的平均产卵数
和平均温度
有关,现收集了以往某地的
组数据,得到下面的散点图及一些统计量的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/cb47839a-c292-4e2f-8bfc-6992d55cad7e.png?resizew=204)
表中
,
.
(1)根据散点图判断,
与
(其中
为自然对数的底数)哪一个更适宜作为平均产卵数
关于平均温度
的回归方程类型?(给出判断即可,不必说明理由)并由判断结果及表中数据,求出
关于
的回归方程.(结果精确到小数点后第三位)
(2)根据以往统计,该地每年平均温度达到
以上时蝗虫会造成严重伤害,需要人工防治,其他情况均不需要人工防治,记该地每年平均温度达到
以上的概率为
.
①记该地今后
年中,恰好需要
次人工防治的概率为
,求
取得最大值时相应的概率
;
②根据①中的结论,当
取最大值时,记该地今后
年中,需要人工防治的次数为
,求
的数学期望和方差.
附:对于一组数据
、
、
、
,其回归直线
的斜率和截距的最小二乘法估计分别为:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f95463e4696bcb6ed28581bad689d0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b06e95b57b7a81cd81d05557a11fa92.png)
平均温度 | |||||||
平均产卵数 |
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/11/cb47839a-c292-4e2f-8bfc-6992d55cad7e.png?resizew=204)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb60609a885037dfe04526ee5c7f0fb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f50c7e9ab48d5d25318b20974df6947.png)
(1)根据散点图判断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6a5b1c19e4c57f1d259f8269e551c64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfda27fc9b91bd26ce352c83c4e99ef5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae6bf7c3198cdd4dafc81e3992f34bd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)根据以往统计,该地每年平均温度达到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e564e197161c0fc0432976090f4c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e564e197161c0fc0432976090f4c32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29c8578f06897aa6fb84aa95c797d3d8.png)
①记该地今后
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cc3ad745dbae1a4473f904218a3cdf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1f109f79547d6ae0d94339e689e8f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1f109f79547d6ae0d94339e689e8f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3606c4a853a6a34cb7f33bea81b15a1f.png)
②根据①中的结论,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed1f109f79547d6ae0d94339e689e8f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
附:对于一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2d09db80da14dbcc34964a4094eeaa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc8c7e7bf1166d9af98ffedbd240fcdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d15e8ee5976bee7b99d65473e409cff2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d9d148babe04c8658cd22c363cafb63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0f38d2e75f52815ff0549ab12d0f208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7ce623ecd322a38c191e15c20a54153.png)
您最近一年使用:0次
2020-07-02更新
|
2586次组卷
|
5卷引用:山东师范大学附属中学2020届高三最后一卷(打靶卷)数学试题
山东师范大学附属中学2020届高三最后一卷(打靶卷)数学试题山东师范大学附属中学2020届高三6月模拟检测数学试题(已下线)考点32 线性回归方程与列联表(练习)-2021年高考数学复习一轮复习笔记重庆市永川北山中学校2022届高三高考预测二数学试题浙江省杭州市2022-2023学年高三上学期期末模拟数学试题
12-13高三上·河北衡水·阶段练习
6 . 设函数
(
),
.
(1) 将函数
图象向右平移一个单位即可得到函数
的图象,试写出
的解析式及值域;
(2) 关于
的不等式
的解集中的整数恰有3个,求实数
的取值范围;
(3)对于函数
与
定义域上的任意实数
,若存在常数
,使得
和
都成立,则称直线
为函数
与
的“分界线”.设
,
,试探究
与
是否存在“分界线”?若存在,求出“分界线”的方程;若不存在,请说明理由.
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/fc4e249d5fd24eb695105bb042005ace.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/39c1cba21390444eb81e688adbd9abc0.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/85141ab90d0a49aa8987c9e3e31f55a3.png)
(1) 将函数
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/3c0da225f1284eb99c2c691536754e92.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/7a7d521af57d47b3a281399bb1e79672.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/7a7d521af57d47b3a281399bb1e79672.png)
(2) 关于
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/2538df56e62a4fc295b07f191b4baecf.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/dcdef66d54bb4a0daf65ebcfd7341ce8.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/9685657796d745c5af1d457768c1375f.png)
(3)对于函数
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/52c243f4ef354dba895989064a8ad83d.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/5058a7bdd1fa4a1fb55e902d1d0c9045.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/2538df56e62a4fc295b07f191b4baecf.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/48e25cfb9ad54e659c4096f7e395654e.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/b9c97980c6a14adf8d5dae753894231c.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/d2ad2ee1fa234b029fc07077fd3c24ec.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/bb418d1edfa848f28071c98bbb8184ac.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/52c243f4ef354dba895989064a8ad83d.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/5058a7bdd1fa4a1fb55e902d1d0c9045.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/844066f053bd4917bc6a94a75063f975.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/1745175dd4f548f39a0d0ab19e2a3c97.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/52c243f4ef354dba895989064a8ad83d.png)
![](https://img.xkw.com/dksih/QBM/2012/1/30/1570706054389760/1570706059927552/STEM/5058a7bdd1fa4a1fb55e902d1d0c9045.png)
您最近一年使用:0次
7 . 已知函数
,
.
(1)当
时,求曲线
在点
处的切线的方程;
(2)若曲线
与
轴有且只有一个交点,求
的取值范围;
(3)设函数
,请写出曲线
与
最多有几个交点.(直接写出结论即可)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02ecf88c5647f13d1c7886da8a7b1bcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da989240786ef7c3e2d903f30caf59e3.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b550ee821ee1838384835e81fc34b67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/706a19c530fee983ba3d24079bddb737.png)
(2)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
(3)设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ca643eb4f1093f1e4d430eabddf789.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1cfb60420ff7e72c1b9d64f69ae063.png)
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名校
解题方法
8 . 某网店销售某种商品,为了解该商品的月销量
(单位:千件)与月售价
(单位:元/件)之间的关系,对近几年的月销售量
和月销售价
数据进行了统计分析,得到了下面的散点图.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/9d91aeb8-3af8-4c54-9536-d06843771555.png?resizew=243)
(1)根据散点图判断,
与
哪一个更适宜作为月销量
关于月销售价
的回归方程类型?(给出判断即可,不需说明理由),并根据判断结果及表中数据,建立
关于
的回归方程;
(2)利用(1)中的结果回答问题:已知该商品的月销售额为
(单位:千元),当月销售量为何值时,商品的月销售额预报值最大?(月销售额=月销售量×当月售价)
参考公式、参考数据及说明:
①对一组数据
,
,…,
,其回归直线
的斜率和截距的最小二乘法估计分别为
,
.
②参考数据:
表中
,
.
③计算时,所有的小数都精确到0.01,如
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4de122ae929b1acaff321dec137622ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83e8008178e4d380d65830a73448aeb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/10/9d91aeb8-3af8-4c54-9536-d06843771555.png?resizew=243)
(1)根据散点图判断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63fe88001dda925936ab7b8186c479e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33b447ac3d1a965572c31b6e4c18d4b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)利用(1)中的结果回答问题:已知该商品的月销售额为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8b9ad2fcfff3dd546c5fdbedfe6238.png)
参考公式、参考数据及说明:
①对一组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe6a8541ef83d543aacb5d47138dd15a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5629e79297d2429e917012331de7dc97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/494d75ee3664babae6dd3f0014cc019f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15d29f9bf74a42f78af0aedf1a069eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd1de0a5372308bdfec31cd743032642.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f4adc227794445f0e0bc1ac852bfaef.png)
②参考数据:
6.50 | 6.60 | 1.75 | 82.50 | 2.70 | -143.25 | -27.54 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90229c4f76db5de308cf8d5fc382099b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/694a29543928e890d4110f990b492c7a.png)
③计算时,所有的小数都精确到0.01,如
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3993ab20122c2c79397917d2d6da2c.png)
您最近一年使用:0次
2020-03-27更新
|
438次组卷
|
2卷引用:广东省第二师范学院番禺附属中学2019-2020学年高二下学期期中段考数学试题
名校
9 . 沙漠蝗虫灾害年年有,今年灾害特别大.为防范罕见暴发的蝗群迁飞入境,我国决定建立起多道防线,从源头上控制沙漠蝗群.经研究,每只蝗虫的平均产卵数
和平均温度
有关,现收集了以往某地的7组数据,得到下面的散点图及一些统计量的值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/19d03aa5-49ee-451f-8df8-e14555881374.png?resizew=189)
,
,
,
,
,
.(其中
,
).
(1)根据散点图判断,
与
(其中
…自然对数的底数)哪一个更适宜作为平均产卵数
关于平均温度
的回归方程类型?(给出判断即可,不必说明理由)并由判断结果及表中数据,求出
关于
的回归方程.(计算结果精确到小数点后第三位)
(2)根据以往统计,该地每年平均温度达到28℃以上时蝗虫会造成严重伤害,需要人工防治,其他情况均不需要人工防治,记该地每年平均温度达到28℃以上的概率为
.
①记该地今后5年中,恰好需要3次人工防治的概率为
,求
的最大值,并求出相应的概率
.
②当
取最大值时,记该地今后5年中,需要人工防治的次数为
,求
的数学期望和方差.
附:线性回归方程系数公式
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/12/19d03aa5-49ee-451f-8df8-e14555881374.png?resizew=189)
平均温度xi℃ | 21 | 23 | 25 | 27 | 29 | 32 | 35 |
平均产卵数yi个 | 7 | 11 | 21 | 24 | 66 | 115 | 325 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfaba2f8ea5f33a77ab03c7f3856950c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cc076e77cb34281b2d04ba8485ae701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d98abbb749b0921fbef747d11c04b8f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b19b8e1a72d060e95c55c1f53c0404d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760a2ee1ef257ec5891968ac1837431c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d7c52be7ab23da0c1218f2e7f3da2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e8ff9e656c87232678bda3882f7ed7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b36e2451de7fffb3b79aedac49379c8.png)
(1)根据散点图判断,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/217a7faaf1f2f80f59d9103979cac557.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5d63e4cc7d7b6bb9421298dccda5c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/872f7b170d31d1d464aba4f99e370721.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)根据以往统计,该地每年平均温度达到28℃以上时蝗虫会造成严重伤害,需要人工防治,其他情况均不需要人工防治,记该地每年平均温度达到28℃以上的概率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44fed1be8b7e50f18cb90077d9fce8e4.png)
①记该地今后5年中,恰好需要3次人工防治的概率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060d9334136396f95e9dcd328486f9d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060d9334136396f95e9dcd328486f9d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/060d9334136396f95e9dcd328486f9d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
附:线性回归方程系数公式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1af4509c54d7d82670d5e27937da24d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a58291bd91befe1061530246da983727.png)
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10 . 下列五个命题,其中正确命题的个数为( )
①已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/315c84dc5c31e1ec58b0957a24caf400.png)
②过原点作直线
的切线,则切线方程为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c603ebebcc2551c4c58a4b1758ed1ad1.png)
③已知随机变量
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4effc9159da3fff945e127842f9836bd.png)
④已知
为正整数,用数学归纳法证明等式
时,若假设
时,命题为真,则还需利用归纳假设再证明
时等式成立,即可证明等式对一切正整数
都成立
⑤在回归分析中,常用
来刻画回归效果,在线性回归模型中,
表示解释变量对于预报变量变化的贡献率,
越接近1,表示回归的效果越好
①已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/978c9adecf65391ace71f8157368cb8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/315c84dc5c31e1ec58b0957a24caf400.png)
②过原点作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f2eff609c6043c2a89a6dd163fe2244.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c603ebebcc2551c4c58a4b1758ed1ad1.png)
③已知随机变量
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8b891ec9d9abbb7ffaa6d1ad01978a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9500cfe7f5ca2b282c258734534e4d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4effc9159da3fff945e127842f9836bd.png)
④已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a7f91d2a8c6a2089372c66069664e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac31dc10e8978562277e84eb9daa923f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ba21f3d0cfc86d40e2e06446623ce0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
⑤在回归分析中,常用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
A.2 | B.3 | C.4 | D.5 |
您最近一年使用:0次