名校
1 . 下列四个命题:
①圆
与直线
相交,所得弦长为
;
②直线
与圆
恒有公共点;
③若棱长为
的正方体的顶点都在同一球面上,则该球的表面积为
;
④若棱长为
的正四面体的顶点都在同一球面上,则该球的体积为
.
其中,正确命题的序号为__________ .(写出所有正确命题的序号)
①圆
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e6187243e8cd83a9ef90bb43faefc65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f52cb58b6bc5d71030463ba7e28134.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
②直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac02a054bd0771a56987af33454baaea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6700e26302ad11083f51f0a658dd66af.png)
③若棱长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5336762254e4560fa5bef6330b8eaeef.png)
④若棱长为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998b456c6884c6f5fc8cd4c73c7f07f1.png)
其中,正确命题的序号为
您最近一年使用:0次
名校
2 . 高斯函数
是用德国著名的数学家高斯的名字命名的,即设
,用
表示不超过
的最大整数,例如
,
.已知函数
,有下列四个结论:①
;②
在
上单调递增;③
的最小值为0;④
没有最大值,其中所有正确结论的序号为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7179c645736d68c90023f83d7f11ed01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24a57996290794e082b21d8f1dfc322a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/985227b7b4703f3ed8717d0abc4febfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec13b2c5950301683e240faf02340617.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e86444c5514b63b441f29c0f511750a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/956cd0c33242381c2f977ab7b0435448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2edd8edcb21bd41584daf9bb95a5c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
A.①②③ | B.①③④ | C.①④ | D.①② |
您最近一年使用:0次
2024-04-08更新
|
198次组卷
|
2卷引用:山西省大同市第二中学校2023-2024学年高一下学期3月月考数学试题
名校
3 . 给出下列命题:其中正确命题的序号为__________ .
①若
,则
;
②若
、
,且
,则
;
③若
,则
是纯虚数;
④若
,则
对应的点在复平面内的第一象限.
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/255483db09b1e523a4fcc1f618b98ec4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61a3363aaa23cf3d6e1a0a637e29ba64.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d285a4c557fc9748105b62ccd94b7859.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/432d77fe5ad3032d59a237dd94c8a638.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f47f2009bcbf3cb4906e4e7e969ad87b.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1e69392d21261afd8e5e5f096634669.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9a33c24b61fbdbf3b55842ec8391bd9.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c36e5c7a7b9f386dbcadd5bbb572d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62bee3bbef602b12f783c95616a35aa7.png)
您最近一年使用:0次
2019-11-13更新
|
328次组卷
|
4卷引用:山西省大同市第一中学2019-2020学年高二下学期3月第二次考试数学(文)试题
解题方法
4 . 为了加强环保知识的宣传,某学校组织了垃圾分类知识竞赛活动.活动设置了四个箱子,分别写有“厨余垃圾”、“有害垃圾”、“可回收物”、“其它垃圾”;另有卡片若干张,每张卡片上写有一种垃圾的名称.每位参赛选手从所有卡片中随机抽取
张,按照自己的判断将每张卡片放入对应的箱子中.按规则,每正确投放一张卡片得
分,投放错误得
分.比如将写有“废电池”的卡片放入写有“有害垃圾”的箱子,得
分,放入其它箱子,得
分.从所有参赛选手中随机抽取
人,将他们的得分按照
、
、
、
、
分组,绘成频率分布直方图如图:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/817abdb4-50ba-4814-b1ce-a8c9940fb79a.png?resizew=257)
(1)分别求出所抽取的
人中得分落在组
和
内的人数;
(2)从所抽取的
人中得分落在组
的选手中随机选取
名选手,以
表示这
名选手中得分不超过
分的人数,求
的分布列和数学期望.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1884b0525f15220a3aa966f75928daca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1416bbe317c1c68814473a92e55d90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b56b3c89f74bf88b956cd1743af755c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a56a1e37424d9f3fd7ccdc52388ef4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c578cc1e837a081232b45d75c4cb8ef2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/817abdb4-50ba-4814-b1ce-a8c9940fb79a.png?resizew=257)
(1)分别求出所抽取的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1884b0525f15220a3aa966f75928daca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1416bbe317c1c68814473a92e55d90.png)
(2)从所抽取的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5f3276205486c639046bd6acf2dbea5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f022950e0faa45b617d497b01b5292b9.png)
您最近一年使用:0次
2020-04-14更新
|
943次组卷
|
3卷引用:山西省大同市2023届高三第一次阶段性模拟数学试题(B卷)