解题方法
1 . 端午节吃粽子,用箬竹叶包裹而成的三角粽是上海地区常见的一种粽子,假设其形状是一个正四面体,如图记作正四面体A-BCD,设棱长为a.![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d72a007e3c4a134956b0e3fbde5f46.png)
(2)求箬竹叶折出的二面角
的大小;
(3)用绳子捆扎三角粽,要求绳子经过正四面体的每一个面、不经过顶点,并且绳子的起点和终点重合.请设计一种捆扎三角粽的方案,使绳子长度最短(不计打结用的绳子),请在图中作出绳子捆扎的路径,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d72a007e3c4a134956b0e3fbde5f46.png)
(2)求箬竹叶折出的二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ec2524be492bca0d1566bf848066f10.png)
(3)用绳子捆扎三角粽,要求绳子经过正四面体的每一个面、不经过顶点,并且绳子的起点和终点重合.请设计一种捆扎三角粽的方案,使绳子长度最短(不计打结用的绳子),请在图中作出绳子捆扎的路径,并说明理由.
您最近一年使用:0次
2 . 已知双曲线
,
是双曲线
上一点.
(1)若椭圆
以双曲线
的顶点为焦点,长轴长为
,求椭圆
的标准方程;
(2)设
是第一象限中双曲线
渐近线上一点,
是双曲线
上一点,且
,求
的面积
(
为坐标原点);
(3)当直线
:
(常数
)与双曲线
的左支交于
、
两点时,分别记直线
、
的斜率为
、
,求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f0e1c08de10bd97b1327a041e74ea88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f54dd475ff1321041c80738b201c3b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
(1)若椭圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41322821ce31416fdac8dd6e0aa41c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e37fe14e04dc277ea1bc92068fd36ae3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fdc02f00cf00a6dfd88b53a90f1f7a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf231f8f86fb922df4ca0c87f044cec3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(3)当直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41b70366c501511ed9686bd73e9ae58f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcd9218a657b17654c5d757a6f7dee9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bcd8ee2d8367c167d6ae0abc741b6b8.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/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6defc43285a40f7ccb74c1cc04265eba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/423b7ae39db552e60ee8b1d27312306f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b69e3f7ddd51215d00661c09cd900d60.png)
您最近一年使用:0次
2023-12-13更新
|
636次组卷
|
5卷引用:上海市高二下学期期末真题必刷04(压轴题)--高二期末考点大串讲(沪教版2020选修)
(已下线)上海市高二下学期期末真题必刷04(压轴题)--高二期末考点大串讲(沪教版2020选修)上海市杨浦区2024届高三上学期模拟质量调研数学试题广东省珠海市第一中学2023-2024学年高二上学期1月阶段测试数学试题上海市宝山区上海交通大学附属中学2023-2024学年高二上学期12月数学卓越测试题(已下线)2024年高考数学全真模拟卷06(新题型地区专用)
名校
3 . 某区12月10日至23日的天气情况如图所示.如:15日是晴天,最低温度是零下9℃,最高温度是零下4℃,当天温差(最高气温与最低气温的差)是5℃.
(1)从10日至21日某天开始,连续统计三天,求这三天中至少有两天是晴天的概率:
(2)从11日至20日中随机抽取两天,求恰好有一天温差不高于5℃的概率:
(3)已知该区当月24日的最低温度是零下10℃.12日至15日温差的方差为
,21日至24日温差的方差为
,若
,请直接写出24日的最高温度.(结论不要求证明)
(注:
,其中
为数据
的平均数)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/f36290ca-bffa-4d5d-82ca-0687b10ac6be.png?resizew=434)
(1)从10日至21日某天开始,连续统计三天,求这三天中至少有两天是晴天的概率:
(2)从11日至20日中随机抽取两天,求恰好有一天温差不高于5℃的概率:
(3)已知该区当月24日的最低温度是零下10℃.12日至15日温差的方差为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfbc29b47b83fdc5368770b7b1acb439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab1295cbd36fdc55a55b549aa2dd5887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b847a6673e99f2f3c08b37a90065d52.png)
(注:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcab5fdeea8f67ba8ecb5c51d12703f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85481cd7e94130ef3aa05b4a39e79cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe1c31a81f198c443e71b83ca662939.png)
您最近一年使用:0次
2024-02-18更新
|
276次组卷
|
2卷引用:北京市清华附中高22级2023-2024学年高二上学期期末数学试题
名校
解题方法
4 . 柯西是一位伟大的法国数学家,许多数学定理和结论都以他的名字命名,柯西不等式就是其中之一,它在数学的众多分支中有精彩应用,柯西不等式的一般形式为:设
,则
当且仅当
或存在一个数
,使得
时,等号成立.
(1)请你写出柯西不等式的二元形式;
(2)设P是棱长为
的正四面体
内的任意一点,点
到四个面的距离分别为
、
、
、
,求
的最小值;
(3)已知无穷正数数列
满足:①存在
,使得
;②对任意正整数
,均有
.求证:对任意
,
,恒有
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81a8a1b208f491296432e9e6bf0e91c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0653d6a0e8778ad47b06d5f6b88cffa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/419c991c4022ef12d4801e119018b587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f31a068fb311eff550b3088a212fb2f0.png)
(1)请你写出柯西不等式的二元形式;
(2)设P是棱长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5edf900c810371fb21297c15f86d8743.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b31ac1def558351e2e3ed1235c570530.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/342d0252c1b2f7d2a84b5c985d19d547.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d31659f106fba3c9750661eb0e3c3eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dde93376f5d29f8f7d501122759b0ab.png)
(3)已知无穷正数数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c24ecf9e59082e563372b12981d03fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee33826e02eda7aa6221649355a5709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9db6b0bf3d360830fff618193c595b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a33ac34aa03dc7f0a5faad6dc664ec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5818ede14d21f6df9ef9c2bfe09286c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cca1d86c9f078347773f700fee49d1d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d191d6de821fbb06a51b5a20112db6de.png)
您最近一年使用:0次
2024-05-20更新
|
436次组卷
|
3卷引用:江苏省南京市东山高级中学南站校区2023-2024学年高一下学期期末考试数学试卷
名校
解题方法
5 . 已知点
,
,
中恰有两个点在抛物线
上.
(1)求
的标准方程![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ca6fa9955690cec01db601e3abce0c.png)
(2)若点
,
在
上,且
,证明:直线
过定点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1294434b22cb5133043a2270ae1c43f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5590337b3868db8523eeb7f448efcf05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45f0ee968f9a247871a54e505fbd111b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9158f21b372fd0390fab040ad65c586.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32ca6fa9955690cec01db601e3abce0c.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8198c3b302b3820e86763428eb1e91cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3463ced6030af957f13f9ba05b977c1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb2356a3833defed220ee1fa481aad2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
您最近一年使用:0次
2024-03-29更新
|
877次组卷
|
2卷引用:山东省青岛市2023-2024学年高二上学期期末学业水平检测数学试题
名校
解题方法
6 . 如图1,等腰
满足
,
,
于
.如图2,将
绕着直线SA旋转时,在BA旋转而成的平面
内总有点
满足
,
,(点
,点
分别在直线BD两侧).
长;
(2)求证:
平面
;
(3)记三棱锥
的体积为
,三棱锥
的体积为
,当四棱锥
的体积最大时,求
值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79482c6de6bbd05affc78f9c625e52f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2affc8264f2e40743bb12dd7ea57177b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe85217cea14241255ec21200b25b16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe0bb7d51e559e73aa16a954fe7fa33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79482c6de6bbd05affc78f9c625e52f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c279c8033acb94c3f91be2e05b0a6bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10c83f8945042b9c8fb2fbdac9308d62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)记三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d535bfd65eb04a29d64425d54b2acf86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69dd9f16a5c7a66e62e52fd66f4449ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c773ac7c3a6575fb7d432c93fe5f2a32.png)
您最近一年使用:0次
名校
解题方法
7 . 已知圆的方程
,
,
,抛物线过
两点,且以圆的切线为准线.
(1)求抛物线焦点的轨迹C的方程;
(2)已知
, 设x轴上一定点
, 过T的直线交轨迹C于
两点(直线
与
轴不重合),求证:
为定值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54329a84abb204cecb237b2bf2ff2bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd99c5000629d7f49499d666e68f40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852b303689c31189cd47bb4a3220f9fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
(1)求抛物线焦点的轨迹C的方程;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c153027427477bcd0a7228b14ce96cc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaf5077ae09443a75fb8301841116a9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b800af3d8614f3f30eefa7de8d0b581f.png)
您最近一年使用:0次
2024-02-03更新
|
900次组卷
|
3卷引用:四川省成都市2023-2024学年高二上学期期末校级调研联考数学试题
8 . 对于给定的奇数
,设
是由
个实数组成的
行
列的数表,且
中所有数不全相同,
中第
行第
列的数
,记
为
的第
行各数之和,
为
的第
列各数之和,其中
.记
.设集合
或
,记
为集合
所含元素的个数.
(1)对以下两个数表
,
,写出
,
,
,
的值;
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/2/e69407e7-892f-4a4f-952f-72fcf655e5f4.png?resizew=138)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/2/c396e40f-d96e-4dad-b60b-54bbd480977d.png?resizew=138)
(2)若
中恰有
个正数,
中恰有
个正数.求证:
;
(3)当
时,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84de01db26d435ab45acdf26cfefe625.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/823b5260d6b24cc69747c0455c879b7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267e1fe5e16e9dc9641c7736528e1235.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/449fa836b7477adb5c394b8e67af6a87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02eca2f89985a104ddeebdf89629ade7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7600d2cfbdc6146db96cc545706004f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f76063c9d41d3398308bf7d25938d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9164331fb78ebe6059e69060f3ab302a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d418009b040d5e5192d28417b459890.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e75ee8469247f599502aec2f2ee552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b811354062228d1e2e090aa587259c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
(1)对以下两个数表
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d98b87ea379019dea6dbd58ebaf19f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebed69dd5f3ef7ff5eccd8031e4771ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc8b030e661224065ec16aa272782b44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a135dc0cf986199b13a3ce1106379e16.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/2/e69407e7-892f-4a4f-952f-72fcf655e5f4.png?resizew=138)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/2/c396e40f-d96e-4dad-b60b-54bbd480977d.png?resizew=138)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de7bdfbb18abcc2d1575d1228489f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5873c01192b7d33b7483f444f90b5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f4518b3c93a17e13fc06affa23e519.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31eb153a2133b41486193e3c3b633d3c.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7a1d739890a8951586e23b78b035bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8181afecca9a1adc761a2184543fd2e5.png)
您最近一年使用:0次
名校
解题方法
9 . 如图,将圆
沿直径
折成直二面角,已知三棱锥
的顶点
在半圆周上,
在另外的半圆周上,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/7df4e362-6b02-418c-b46e-03f9a8d24516.png?resizew=147)
(1)若
,求证:
;
(2)若
,
,直线
与平面
所成的角为
,求点
到直线
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23d352cc181bd3e1172014eadc9ab0e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08c74fb8e175ebc3bd48a791b7371a8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/771b610e4ddefa739a985d1e5462ce5a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/17/7df4e362-6b02-418c-b46e-03f9a8d24516.png?resizew=147)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faec879692b23ee31c5deb95f2524ac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0de6dce28eda82f5373eeac1a04ebb40.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c4a85e7cdbebd03a5557720988fb604.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30f457418e6a7e21f0ed0bf490a3709c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
您最近一年使用:0次
10 . 在机器学习中,精确率
、召回率
、卡帕系数
是衡量算法性能的重要指标.科研机构为了测试某型号扫雷机器人的检测效果,将模拟战场分为100个位点,并在部分位点部署地雷.扫雷机器人依次对每个位点进行检测,
表示事件“选到的位点实际有雷”,
表示事件“选到的位点检测到有雷”,定义:精确率
,召回率
,卡帕系数
,其中
.
(1)若某次测试的结果如下表所示,求该扫雷机器人的精确率
和召回率
.
(2)对任意一次测试,证明:
.
(3)若
,则认为机器人的检测效果良好;若
,则认为检测效果一般;若
,则认为检测效果差.根据卡帕系数
评价(1)中机器人的检测效果.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.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/035744497a9eb070b633d78e5a2973ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c150fe2837b2d6a191e77fcc4fd984d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/016078f7e8096746515b68f3d88e6edf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7999bf73a3e99b33a7dc9e27605f13ea.png)
(1)若某次测试的结果如下表所示,求该扫雷机器人的精确率
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
实际有雷 | 实际无雷 | 总计 | |
检测到有雷 | 40 | 24 | 64 |
检测到无雷 | 10 | 26 | 36 |
总计 | 50 | 50 | 100 |
(2)对任意一次测试,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01e8b6a9cfa7a1f79de242e13701a8d2.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/326127fdb2c7118ad2c942704c35bf89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a914996508a498faac0d74e21536cb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb4f8b2dcaf2be0c42f852400d758acd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次