名校
1 . 当
时,关于
的分式不等式
的解区间为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a2f4630b66f80a5f2b7f186e49b321e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9057d90cc7c5a8c3eaac6960c485c496.png)
您最近一年使用:0次
2021-12-01更新
|
924次组卷
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6卷引用:吉林省松原市扶余市第一实验学校2022-2023学年高一上学期第一次教学质量验收数学试题
2 . 三角学起源于土地和天文学中的测量.1752年,法国天文学家拉卡伊(1713-1762)和他的学生拉朗德(1732-1807)利用三角测量法首次精确地计算出地月距离.他们的测量方案是:拉卡伊和拉朗德分别来到观测地德国柏林(A点)和非洲南端的好望角(
点),这两个地方经度相近,可看做在同一经度线上,纬度分别是北纬
度和南纬
度,他们同一时间分别在这两个地方进行观测.如图所示,当夜幕降临时,月亮从地平线上越升越高,当它到达最高点,即
是平面四边形时,在A点(柏林)测出月亮的天顶距
(即离开头顶方向的角度),在
点(好望角)测出月亮的天顶距
.在
中求出
,和
,在此基础上,解
,求出地月距离的近似值
或
.设地球的半径为
,利用测量方案中提供的数据(
,
,
,
,
),求:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/f0e204c4-a785-4edc-91a8-0d88f67d30f4.png?resizew=184)
(1)
和
;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e12ee28006ffc4b287e6762b01608852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc43aea5dd0fef2081e399adb23560e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/997ac1051092089b358afbad3a3d6874.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943b765718479c160ba61ec5c6f8c5f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e29bf5652f0d4f764c3606efcdb445f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3daae8ec60b2b1f7577dee687247cebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/943b765718479c160ba61ec5c6f8c5f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e29bf5652f0d4f764c3606efcdb445f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e12ee28006ffc4b287e6762b01608852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc43aea5dd0fef2081e399adb23560e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/9/f0e204c4-a785-4edc-91a8-0d88f67d30f4.png?resizew=184)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3daae8ec60b2b1f7577dee687247cebb.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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解题方法
3 . 某大学为了解学生对
两家餐厅的满意度情况,从在
两家餐厅都用过餐的学生中随机抽取了100人,每人分别对这两家餐厅进行满意指数打分(满意指数是指学生对餐厅满意度情况的打分,分数设置为
分
.根据打分结果按
,
分组,得到如图所示的频率分布直方图,其中
餐厅满意指数在
中有30人.
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897255525154816/2897823459229696/STEM/ed11603606ad443a8f86d7d92d5ffef1.png?resizew=505)
(1)求
餐厅满意指数频率分布直方图中
的值;
(2)利用样本估计总体的思想,估计
餐厅满意指数和
餐厅满意指数的平均数及方差(同一组中的数据用该组区间中点值作代表);
参考公式:
,其中
为
的平均数,
分别为
对应的频率.
(3)如果一名新来同学打算从
两家餐厅中选择一个用餐,你建议选择哪个餐厅?说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09b5b2fc7c186283078e0bdeb05ce88b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad091e740d8372636fcf07488dd9ad4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71913ad3245e04f709e91a68553f8a75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0444510dc61b55970da805473b722f7a.png)
![](https://img.xkw.com/dksih/QBM/2022/1/18/2897255525154816/2897823459229696/STEM/ed11603606ad443a8f86d7d92d5ffef1.png?resizew=505)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
(2)利用样本估计总体的思想,估计
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b88bbb822fa926be75e343ce7977de0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85481cd7e94130ef3aa05b4a39e79cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe1c31a81f198c443e71b83ca662939.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51d9cf284a6d151f05fc8fe80d36c4b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe1c31a81f198c443e71b83ca662939.png)
(3)如果一名新来同学打算从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
您最近一年使用:0次
2022-01-19更新
|
1380次组卷
|
6卷引用:吉林省吉林市吉化第一高级中学校2021-2022学年高一下学期期中考试数学试题
吉林省吉林市吉化第一高级中学校2021-2022学年高一下学期期中考试数学试题山东省潍坊市2021-2022学年高一上学期期末数学试题(已下线)9.2 用样本估计总体~9.3 统计案例 公司员工的肥胖情况调查分析-2021-2022学年高一数学10分钟课前预习练(人教A版2019必修第二册)(已下线)第13讲 用样本估计总体(核心考点讲与练)-2021-2022学年高一数学考试满分全攻略(人教A版2019必修第二册)(已下线)9.3 统计案例 公司员工的肥胖情况调查分析(分层作业)-【上好课】山东省高密市第一中学2023-2024学年高一上学期冬学竞赛数学试题