1 . 如图,在
中,
分别是
的中点.从条件①
;②
中选择一个作为已知条件,完成以下问题:
![](https://img.xkw.com/dksih/QBM/2022/5/19/2983014030344192/2984836545576960/STEM/db9265e4f85c430a9a51e7a05f27492f.png?resizew=220)
(1)求
的余弦值;
(2)若
相交于点
,求
的余弦值.
(注:若两个条件都选择作答,则按第一个条件作答内容给分)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efe0fa00b1e1523a0f1cec2ca5eafc91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cca04b2a2b61d62a809776670a60c09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d8332bf70ea360b452b85e20a7d081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f25a13423cebb3b19c9b9bbd21a7286.png)
![](https://img.xkw.com/dksih/QBM/2022/5/19/2983014030344192/2984836545576960/STEM/db9265e4f85c430a9a51e7a05f27492f.png?resizew=220)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/268544817735d20ffbceef3b26db5dde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7d6902c8862bd2616be038549f77aff.png)
(注:若两个条件都选择作答,则按第一个条件作答内容给分)
您最近一年使用:0次
2022-05-22更新
|
1115次组卷
|
4卷引用:重庆市巴蜀中学校2022届高三下学期适应性月考(十)数学试题
重庆市巴蜀中学校2022届高三下学期适应性月考(十)数学试题云南省昆明市第二十四中学2021~2022学年高二下学期期末统考数学模拟试题(已下线)专题4-5 解三角形大题归类 -1(已下线)专题12 解三角形综合-1
名校
解题方法
2 . 甲、乙两名同学参加某个比赛,比赛开始前
箱子中装有3个红球3个白球,
箱子中装有1个红球2个白球.比赛规则是:先由甲同学从
箱子中每次取一个球放入
箱子中,若从
箱子中放入
箱子中的球是红球则停止取球,若是白球则继续取球放球过程,直到第一次取到红球并放入
箱子中为止.然后再由乙同学从
箱子中任取一个球,若取出的是红球则乙同学获胜,否则甲同学获胜.
(1)用
表示甲同学从
箱子中取出放入
箱子中球的个数,求
的分布列及数学期望;
(2)求甲同学获胜的概率.
![](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/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.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/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(1)用
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.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/f022950e0faa45b617d497b01b5292b9.png)
(2)求甲同学获胜的概率.
您最近一年使用:0次
名校
解题方法
3 . 如图所示,已知某海域有三座海洋观察站A,B,C,这三座海洋观察站在一条直线上,AB与BC都等于
.工作人员发现在点M处有一艘渔船.
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978458749018112/2981260636561408/STEM/68dff0f9-af06-4cbf-8ac7-dd9c05d15cd8.png?resizew=178)
(1)若某一时刻这艘渔船M在B的正东方,在A的北偏东
方向,在C的南偏东
方向,求
的值;
(2)若渔船M在行驶过程中始终保持对观察站A,C的张角不变,即始终有
,求BM的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16c6ef1e3e41adb23db0b559421bf757.png)
![](https://img.xkw.com/dksih/QBM/2022/5/13/2978458749018112/2981260636561408/STEM/68dff0f9-af06-4cbf-8ac7-dd9c05d15cd8.png?resizew=178)
(1)若某一时刻这艘渔船M在B的正东方,在A的北偏东
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a4c9b697e3df2b5469b71d3b5e47a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0987cdf15a1e8c58e5a3245c4427a66.png)
(2)若渔船M在行驶过程中始终保持对观察站A,C的张角不变,即始终有
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2609965d77a4281d31701335be9ae66d.png)
您最近一年使用:0次
名校
解题方法
4 . 正方形ABCD中,
,点O为正方形内一个动点,且
,设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96643cc016e7e68f30c445bf47936a3.png)
(1)当
时,求
的值;
(2)若P为平面ABCD外一点,满足
,记
,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91934cac6477909cf68ec266f562a397.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d96643cc016e7e68f30c445bf47936a3.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bc1f08c7640e62e8717abf4d44a6c83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7444214a631d3904f722bc05f07d0f0.png)
(2)若P为平面ABCD外一点,满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1909a3a6c9c51b7232cbf5acdfdc734.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c5b8a21ed3092f78d0c6c05267b635.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd288d4152caf5fc8187a1a901c8949f.png)
您最近一年使用:0次
2022-05-17更新
|
3113次组卷
|
5卷引用:重庆市巴蜀中学校2021-2022学年高一下学期期中数学试题
名校
解题方法
5 . 已知抛物线C;
,F为抛物线的焦点,直线
和抛物线交于不同两点A,B,直线
和x轴交于点N,直线AF和直线BN交于点
.
(1)若
,求三角形AMN的面积
(用p表示);
(2)求证:点M在抛物线C上
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7089148c36cb3c39af71de653756396a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36d71f015144ffaf1faec94a259b4a06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b64b91d079810d968b9ef63e3284c7af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22962a2ad892cb6b14ab039a06e8cdc6.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/321f47a0108711ce22b6bc7d2210549a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebd202795b7a02b784a4dd6eb00e483f.png)
(2)求证:点M在抛物线C上
您最近一年使用:0次
名校
6 . 精准扶贫、精准脱贫是扶贫工作的战略部署,是全面建成小康社会、实现民族复兴的重要保障在当地党和政府的支持和帮助下,某贫困户开始种植一种夏季生长的经济作物.该类经济作物的质量以其质量指标值来衡量,下图是该经济作物的质量指标值t关于昼夜温差x(单位:℃)的散点图.
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967974371221504/2970303036129280/STEM/ad3253b9-cdc7-432e-a577-d74f2c2d2fb8.png?resizew=232)
(参考数据:
,
)
(1)根据散点图可以认为x与t之间存在线性相关关系,且相关系数
,试用最小二乘法求出线性回归方程
;
(2)经过市场调查,按质量指标值t可将该类经济作物分成三级,对应的每公斤售价如下表所示:
经统计分析,该类经济作物的质量指标值
,其中μ近似为散点图中质量指标值的样本均值,
近似为散点图中质量指标值的样本标准差s,若在种植过程中,每公斤产出需要的成本约为10元,且今年产出了2000公斤,求该贫困户种植该经济作物的年纯收入为多少?
(附:①对于-组数据
,
,…,
,其回归直线方程
的斜率和截距的最小二乘估计分别为
,
.样本相关系数为
.
②若
,则
,
,
,
)
![](https://img.xkw.com/dksih/QBM/2022/4/28/2967974371221504/2970303036129280/STEM/ad3253b9-cdc7-432e-a577-d74f2c2d2fb8.png?resizew=232)
(参考数据:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9505cdba294de04fb53fe6ed8ef03243.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2a4644d58e24c35e9ac33979ae37738.png)
(1)根据散点图可以认为x与t之间存在线性相关关系,且相关系数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc184fed754cc8063e143cdfe6f3a6d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e7d5aef1fba766e31a7ccac62f33066.png)
(2)经过市场调查,按质量指标值t可将该类经济作物分成三级,对应的每公斤售价如下表所示:
等级 | 二级 | 一级 | 特级 |
质量指标值 | ![]() | ![]() | ![]() |
每公斤售价(元) | 20 | 45 | 60 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc8035b9e4b3271e0c5bf2a03a7f6972.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/700458c01a7ad031e27d80ed43e9e882.png)
(附:①对于-组数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdc35a0aad280aedf9eeac7454b37d17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1865d3af543c0479173ec453324014a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96aa2c59a16e1403f818b1293674b6b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee9e88d0e248fdf9497aad58d7c77ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/25bb9af4406cc1decda17b5547cc4dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11f0aef337d3226736a8efbe223fbfd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29ab4598328beabf1f1e59acf37ea28b.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4143a85c8489639073284c4d2e4e177b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5266b5bcf89d1bb3069a7dde14b0fb5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895a57ce1fd0692984d9a5443c4d2acc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f808fcdf1ba1e7eb06a752b93da8fcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1592ccbc3b42727b14988edef81e3f40.png)
您最近一年使用:0次
名校
7 . 为了庆祝重庆市直辖25周年,重庆市政府计划在部分主干道两旁的路灯杆上悬挂宣传板.该宣传板由两个三角形AB C和PBC拼接而成(如图),其中
,设![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4dd874a2fd8bc11be5329685e4a14c.png)
![](https://img.xkw.com/dksih/QBM/2022/3/25/2943879637368832/2946612443185152/STEM/166b46fc-1542-453c-b3f7-cf654e44ac77.png?resizew=184)
(1)若要达到最好的宣传效果,则需要满足
,且
达到最大值,求α为多少时,
达到最大值,最大值为多少?
(2)若要让宣传板达到最佳稳定性,则需要满足
,且
达到最大值,求a为多少时,
达到最大值,最大值为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19f601d7569f78401f4a20700c9fe458.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4dd874a2fd8bc11be5329685e4a14c.png)
![](https://img.xkw.com/dksih/QBM/2022/3/25/2943879637368832/2946612443185152/STEM/166b46fc-1542-453c-b3f7-cf654e44ac77.png?resizew=184)
(1)若要达到最好的宣传效果,则需要满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27d529e96fe7e3beaff79c6fcd6c6433.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0037d04ac20f7acf3914430fcc370efc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0037d04ac20f7acf3914430fcc370efc.png)
(2)若要让宣传板达到最佳稳定性,则需要满足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc1726bf8c7fb1f087c7e0dc8d661246.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0561532c1746d8badfc2aee2623c08d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0561532c1746d8badfc2aee2623c08d.png)
您最近一年使用:0次
2022-03-29更新
|
453次组卷
|
2卷引用:重庆市巴蜀中学2021-2022学年高一下学期3月月考数学试题
8 . 设
,
,函数
与
在x=0处有相同的切线.
(1)求a的值;
(2)求证:当
时,
;
(3)若一个盒子里装有n(
且
)个不同的彩色球,其中只有一个白球,每次从中随机抽取一个,然后放回,只要取到白球就停止抽取,记抽取2次就中止的概率为
,抽取3次就中止的概率为
,设
(
且
),求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b1782aae9e94f964f5fb4f4de8586fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d7e6d0c740f11e8cedd67d4971c5299.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4669810732b633b60dbeaf0bf57204f6.png)
(1)求a的值;
(2)求证:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d7190b985a8dc685f2457d0fe34bae7.png)
(3)若一个盒子里装有n(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97769855336d73371930df1f187875e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6df833207f2783ac1b0c82a3a417a7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5594dd51e52ff94e16481464c382e6c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c626bf75ac2e0e6f4ed1b8a29000ba79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e97769855336d73371930df1f187875e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194ae72f54dbd8f6da4eb32bf4d152b1.png)
您最近一年使用:0次
名校
解题方法
9 . 第24届冬季奥林匹克运动会(The XXIV Olympic Winter Games),即2022年北京冬季奥运会,于2022年2月4日星期五开幕,2月20日星期日闭幕.北京冬季奥运会设7个大项,15个分项,109个小项.北京赛区承办所有的冰上项目;延庆赛区承办雪车、雪橇及高山滑雪项目;张家口赛区的崇礼区承办除雪车、雪橇及高山滑雪之外的所有雪上项目.某运动队拟派出甲、乙、丙三人去参加自由式滑雪.比赛分为初赛和决赛,其中初赛有两轮,只有两轮都获胜才能进入决赛.已知甲在每轮比赛中获胜的概率均为
;乙在第一轮和第二轮比赛中获胜的概率分别为
和
;丙在第一轮和第二轮获胜的概率分别是p和
,其中
.
(1)甲、乙、丙三人中,谁进入决赛的可能性最大;
(2)若甲、乙、丙三人中恰有两人进入决赛的概率为
,求p的值;
(3)在(2)的条件下,设进入决赛的人数为
,求
的分布列.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7294f5ae2a24ff42e84cd9773b2a7287.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6503ca085e3ca5f2ba723b0dd66e210b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6fa174dffdf8206c7c51b514769dd9b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee34861e71a34cb0d9aa743f632c8c2.png)
(1)甲、乙、丙三人中,谁进入决赛的可能性最大;
(2)若甲、乙、丙三人中恰有两人进入决赛的概率为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87cef76f652c0ae9e40cc5f57c9c3c93.png)
(3)在(2)的条件下,设进入决赛的人数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
您最近一年使用:0次
2022-02-21更新
|
3476次组卷
|
8卷引用:重庆市巴蜀中学2022届高三高考适应性月考(七)数学试题
重庆市巴蜀中学2022届高三高考适应性月考(七)数学试题(已下线)专题4.3 模拟卷(3)-2022年高考数学大数据精选模拟卷(新高考地区专用)河北省衡水市第二中学2021-2022学年高二下学期期中数学试题安徽省安庆市怀宁中学2021-2022学年高二下学期期中数学试题山东省五莲县、诸城市、安丘市、兰山区四县区2022届高三过程性测试数学试题重庆市凤鸣山中学2023届高三上学期12月月考数学试题(已下线)7.2 离散型随机变量及其分布列 (精讲)(2)江苏省无锡市锡东高级中学2023-2024学年高二下学期期中考试数学试题
名校
解题方法
10 . 对于两个函数:
和
,
的最大值为M,若存在最小的正整数k,使得
恒成立,则称
是
的“k阶上界函数”.
(1)若
,
是
的“k阶上界函数”.求k的值;
(2)已知
,设
,
,
.
(i)求
的最小值和最大值;
(ii)求证:
是
的“2阶上界函数”.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a1cfb60420ff7e72c1b9d64f69ae063.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d6afd1b3aeae1bd415dba90e50c001c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ffea0f7bb26c02be91008a3a992a27b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be1ce3f01e2b6364f9a9fdaf197d5e29.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea5289677c3bf66194c475c4c44f4a05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f06f45220c23094a3d9ef53b54b89d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2bc8d66faac1a06acfec68e28086bf.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81b89d55ca6a541bce15e141a7e38285.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66f0ca536621ec8db02707ba65917029.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36ff2689759a35f3a8030b02be7a22c3.png)
(i)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
(ii)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0eb7df298a9364b36e079a61caec815c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e49794721f5504dd828acf49be37ff42.png)
您最近一年使用:0次
2022-01-24更新
|
1604次组卷
|
2卷引用:重庆市巴蜀中学2021-2022学年高一上学期期末数学试题