名校
解题方法
1 . 已知三角形
的三边长分别为
,有以下
个命题:
①以
为边长的三角形一定存在;
②以
为边长的三角形一定存在;
③以
为边长的三角形一定存在;
④以
为边长的三角形一定存在,其中正确的命题有_______ (填写所有正确命题的序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
①以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd728e84f78f674b575b18ad478bb58e.png)
②以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d6e7e03305ce819a63b754cab365c6c.png)
③以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a28eec82b884b82aefe8ebba66db7b89.png)
④以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f324b36a310f9beb56b121848f7591.png)
您最近一年使用:0次
2 . 定义:如果任取一个正常数
,使得定义在
上的函数
对于任意实数
,存在非零常数
,使
,则称函数
是“
函数”.在①
,②
,③
这三个函数中,为“
函数”的是__________ (只填写序号).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43b2faa4f81f32d94612dce724e772b.png)
![](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/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/014f03c7ff417d0f58c98f21c596a6d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa6342e0a5a8942cfb1cf535ceb2c50d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6297d03ab21d3f759defd9d2ccefb73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c904567c3b3734e1eca8d042ef7a7b2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b734e8f1546481e3eb4976008a045de.png)
您最近一年使用:0次
名校
解题方法
3 . 李老师在黑板上写下一个等式
,请同学们在两个括号内各填写一个正数,使得等号成立,哪个同学所填的两个数之和最小,则该同学获得“优胜奖”.小郭同学要想确保获得“优胜奖”,他应该在前一个括号内填上数字______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21656e5720a7210920bc21565dd4ca23.png)
您最近一年使用:0次
2023-09-29更新
|
275次组卷
|
4卷引用:河南省新高中创新联盟TOP二十名校2023-2024学年高一上学期9月调研考试数学试题
4 . 有下列结论:
①某年级有男生
人,女生
人,用分层抽样的方法从该年级学生中抽取一个容量为
的样本,则此样本中男生人数为
;
②一个容量为
的样本中数据的最大值是
,最小值是
,组距是
,则列频率分布表时应将样本数据分为
组;
③若
关于
的线性回归方程为
,其中
的取值依次为
,
,
,
,
,则
;
④用一组样本数据
,
,
,
,
估计总体的标准差,若样本的平均数为
,则估计总体的标准差为
.
其中正确的有__________ .(填写所有正确结论的序号)
①某年级有男生
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c889d1b18a0c98d18cf99b7878cec350.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33d848b410318b14f82111491a042dd2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/514e9fb0780f5034a50554c9cf0c15ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3864983798fe836a591e13783fd9e82.png)
②一个容量为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f959e5f8d89390f0f136f6acc9f6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17e85c53a287e873f35c9ca64972023c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e595b1cc755cf0dd076e91cf9e9a3e5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
③若
![](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/e3d6417d2b22f49c6d40286e12e2e781.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/180ea775f2af05650404d764384e7faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/784ee235badd54e39f2f7cecbc99a610.png)
④用一组样本数据
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d0b71b8d2c183154221f717ce09077b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d02ea8c4988c5c28ab93f0d70fb55a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
其中正确的有
您最近一年使用:0次
名校
5 . 在某高传染性病毒流行期间,为了建立指标显示疫情已受控制,以便向该地区居民显示可以过正常生活,有公共卫生专家建议的指标是“连续7天每天新增感染人数不超过5人”,根据连续7天的新增病例数计算,下列各个选项中,一定符合上述指标的是__________ (填写序号).
①平均数
; ②标准差
; ③平均数
且极差小于或等于2;
④平均数
且标准差
; ⑤众数等于1且极差小于或等于4.
①平均数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e8f35fd5b4fffe33122c92f0ff4d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e415bbcecbf8992800b327bafec803.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e8f35fd5b4fffe33122c92f0ff4d69.png)
④平均数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80e8f35fd5b4fffe33122c92f0ff4d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e415bbcecbf8992800b327bafec803.png)
您最近一年使用:0次
2022-03-28更新
|
282次组卷
|
10卷引用:2016-2017学年河南省南阳市高一下学期期中质量评估数学试卷
2016-2017学年河南省南阳市高一下学期期中质量评估数学试卷河南省信阳高级中学2020-2021学年高二下学期回顾测试数学(理)试题湖南省邵阳市邵东市第三中学2020-2021学年高一上学期第二次月考数学试题宁夏银川市第二中学2021-2022学年高一上学期期末考试数学试题湖北省襄阳市第五中学2021-2022学年高一下学期6月月考数学试题内蒙古赤峰二中2016-2017学年高二下学期第二次月考数学(理)试题2020届天津市第四中学高三年高考模拟(4月份)数学试题江西省南昌市八一中学、洪都中学、十七中三校2021届高三上学期期末联考数学(文)试题江西省南昌市八一中学、洪都中学、十七中三校2021届高三上学期期末联考数学(理)试题(已下线)考点50 统计-备战2021年高考数学经典小题考前必刷(新高考地区专用)
名校
6 . 集合
,集合
,下列
,
间的关系:①A为B的真子集;②B为A的真子集;③
,其中正确的是___________ .(填写相应序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0c3ea9ce901a68a64a6c0e8662e718b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db0ca4023be6da8f1574b3b1ee8bffe0.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/46a70d32c64918aa4d1d9d3ce0bdbf7b.png)
您最近一年使用:0次
2020-10-23更新
|
479次组卷
|
4卷引用:河南省周口市周口恒大中学2023-2024学年高一上学期9月月考数学试题
解题方法
7 . 如图,在正方体
中,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/6c0d410b-9639-4583-88dd-cf29de37c0da.png?resizew=176)
(1)求证:
平面
;
(2)求证:平面
平面
.(只需在下面横线上填写给出的如下结论的序号 :①
平面
,②
平面
,③
,④
,⑤
)
证明:(1)设
,连接
.因为底面
是正方形,所以
为
的中点,又
是
的中点,所以_________.因为
平面
,____________,所以
平面
.
(2)因为
平面
平面
,所以___________,因为底面
是正方形,所以_______,又因为
平面
平面
,所以_________.又
平面
,所以平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/4/6c0d410b-9639-4583-88dd-cf29de37c0da.png?resizew=176)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f11f1840eb8b17e7b07c3fe7e987a9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
(2)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077dcbb7a11d1ab7c9644bd1fe9b4368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc78a86b12ba0b4553135a3a635fc418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cffb30e92f06a10b82da994fa304d2c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d7af0ab753d5017928560ae47de106.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105cdc325328b683456c1443f6296f8b.png)
证明:(1)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a23f01af749100e1888bba06268843db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2104bb78c7d7d58c1f51a25daa8086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f11f1840eb8b17e7b07c3fe7e987a9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
(2)因为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddbb0422a136f45653c8c369f2d75fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9263a4c1054ec924e900a1544180a83b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22bc82cd42e79c932abe14fa79265ed3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a03f5a663501d8fa265fdb593ed4bfab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc78a86b12ba0b4553135a3a635fc418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f196748dc6a0d0bd9e9e4dd30ac4ed0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077dcbb7a11d1ab7c9644bd1fe9b4368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca48c18021e7be4bbb3e95576e1c1b5f.png)
您最近一年使用:0次
8 . 如图所示,点P在由线段AB,AC的延长线及线段BC围成的阴影区域内(不含边界),则下列说法中正确的是__________ .(填写所有正确说法的序号)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/d9fc9baf-f9fc-4bf6-8df2-131b375ed00b.jpg?resizew=182)
①存在点P,使得
;
②存在点P,使得
;
③存在点P,使得
;
④存在点P,使得
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/d9fc9baf-f9fc-4bf6-8df2-131b375ed00b.jpg?resizew=182)
①存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c60f47c0679c35ab9380bc788973637.png)
②存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afea9691c35520eca10232fe691b8c8d.png)
③存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47e90e7c8536143c8d1d883d86a3e7ae.png)
④存在点P,使得
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f4c9b1e7c8bb335153e2ebf69c8ef2.png)
您最近一年使用:0次
9 . 下列四个命题:
①函数
与
的图象相同;
②函数
的最小正周期是
;
③函数
的图象关于直线
对称;
④函数
在区间
上是减函数.
其中正确的命题是__________ (填写所有正确命题的序号)
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/234310a1e4580ccf8987f034e13a4c59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75dc6c17948bc3bc11a776ec346d9f9d.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec95a180f925a142e2dc39808a483603.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ebba6ed1add0fe647c0226614b9290.png)
③函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776c6bf310777afe3422a949d1ec89b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff420ca0d6e2e7d434a933cf6c5792b.png)
④函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0e723fc808c763c238067e724d94abc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b355f70e175cfb3b1d6ed8ad23841e8e.png)
其中正确的命题是
您最近一年使用:0次
2019-04-29更新
|
790次组卷
|
3卷引用:【市级联考】河南省新乡市2018-2019学年高一下学期期中考试数学试题
解题方法
10 . 已知
表示不超过
的最大整数,定义函数
.有下列结论:
①函数的图象是一条直线;②函数
的值域为
;
③方程
有无数个解;④函数是
上的增函数.
其中错误的是______ .(填写所有错误结论的序号)
![](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/602c6c52cae281dc7dad9bc7cc07d6bb.png)
①函数的图象是一条直线;②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2fc9e0dce53875ba108a4a041fcbf1a.png)
③方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad56942439368d413f74e0ab7d9fb23c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
其中错误的是
您最近一年使用:0次
2020-12-02更新
|
366次组卷
|
3卷引用:河南省周口市太康县第二高级中学2022-2023学年高一上学期10月月考数学试题