1 . 如图,在正方体
中,棱长为1 ,点
为线段
上的动点(包含线段端点),则下列结论正确的______ .
①当
时,
平面
;
②当
时,
平面
;
③
的最大值为
;
④
的最小值为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ce1a6179fb45db68292a6737b80cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff55f4780bb3fb376c9a04dbfbb1d989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ce1a6179fb45db68292a6737b80cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d26d8a9d64ad3c8cba28840b41ed7837.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714ae984b13488d536f583f610e59945.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6913da03b6e87d163d17c1dc34295c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ff7caec4fdd8fb54a3ffbff9692414.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2814a0d93a9cafb77e63a82cd9b67a48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38be38165dc2307982fc57001a447c56.png)
![](https://img.xkw.com/dksih/QBM/2017/6/5/1702196275322880/1737617068105728/STEM/8422de04a03642debb293965a81d872a.png?resizew=195)
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2017-07-25更新
|
1350次组卷
|
2卷引用:辽宁省沈阳市东北育才学校2017届高三第九次模拟考试数学(理)试题
名校
2 . 三角形ABC中,
,且
,则三角形ABC面积最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/382b07bbccec91dabe9de47affb99161.png)
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名校
3 . 对任意的正数
,都存在两个不同的正数
,使
成立,则实数
的取值范围是 _________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3762302b8b549c8234a7865af47d4df4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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2017-07-19更新
|
333次组卷
|
2卷引用:辽宁省沈阳市东北育才学校2016-2017学年高二下学期第二阶段测试数学(理)试题
4 . 下列命题中,正确的命题有__________ .
①回归直线
恒过样本点的中心
,且至少过一个样本点;
②将一组数据的每个数据都加一个相同的常数后,方差不变;
③用相关指数
来刻画回归效果,
越接近
,说明模型的拟合效果越好;
④用系统抽样法从
名学生中抽取容量为
的样本,将
名学生从
编号,按编号顺序平均分成
组(
号,
号,
号),若第
组抽出的号码为
,则第一组中用抽签法确定的号码为
号.
①回归直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1db6103cb0f1d2bd6b19235d53ee7e98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1673cb74c1d577dec996e7281bc39f18.png)
②将一组数据的每个数据都加一个相同的常数后,方差不变;
③用相关指数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c85067c53e936ef32da818efe04bdbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
④用系统抽样法从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3864983798fe836a591e13783fd9e82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3864983798fe836a591e13783fd9e82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c580eb80d39f2f51794889049205ee0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7f27ebcef70a3ebbbe8d2e53ea0896.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee9ff72d210845d3dfd48842e448d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a311d7d7ba31c07ea1a119961cdb9efa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8391ac43e48d7873be61510691629cb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c748e40ba21ac5063d3bccaa57ef278.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/863032d04d6d07e73f43b44ee41020c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
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2017-06-12更新
|
4305次组卷
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7卷引用:东北师大附中、哈尔滨师大附中、辽宁省实验中学2017届高三下学期第四次联合模拟考试数学(理)试题
东北师大附中、哈尔滨师大附中、辽宁省实验中学2017届高三下学期第四次联合模拟考试数学(理)试题(已下线)卷05-备战2020年新高考数学自学检测黄金10卷-《2020年新高考政策解读与配套资源》新疆兵地十校2019-2020学年高二上学期期末考试数学(理)试题山西省朔州市怀仁市2020-2021学年高二下学期期末数学(文)试题(已下线)第01讲 线性回归分析-【帮课堂】2021-2022学年高二数学同步精品讲义(苏教版2019选择性必修第二册)(已下线)2022年高考考前20天终极冲刺攻略(四)【理科数学】(6月2日)(已下线)考点10-2 回归分析与独立检验
名校
5 . 已知圆
,点
为直线
上一动点,过点
向圆
引两条切线
,其中
为切点,则
的取值范围为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/063e7c14c4c0049b13e585b848d1d9a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be5e9da07e14cdc3898d83f9f175831.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/790ef3382b1c731f2885eecfd92c2a86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01c74a907dda6bb7d9d56d009d9df253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ee372b851f45d178b9bbcd3bb02ca82.png)
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2017-06-05更新
|
2513次组卷
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7卷引用:辽宁省实验中学2017届高三下学期第六次模拟考试数学(文)试题
名校
解题方法
6 . 已知空间四边形
中,
,
,
,若平面
平面
,则该几何体的外接球表面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a06c2ff56ff0bdd24682d1272ad9535.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18120a244d3a1f9c1688bf53eb2ad775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcf6dc837ae85207789b94d109c5c2eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
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2017-06-05更新
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3171次组卷
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7卷引用:辽宁省实验中学2017届高三下学期第六次模拟考试数学(文)试题
辽宁省实验中学2017届高三下学期第六次模拟考试数学(文)试题辽宁省葫芦岛协作体2017届高三下学期模拟考试(6月)数学(文)试题广东省梅州市兴宁市第一中学2019-2020学年高三上学期期末数学(文)试题2018届湖南省怀化市高三第二次模拟数学(文)试题山东省新泰市第一中学2019-2020学年高一下学期期中考试数学试题福建省莆田第十五中学2018-2019学年高二下学期期中测试数学(文)试题(已下线)高一数学下学期期中精选50题(压轴版)-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)
7 . 设
是定义在
上的偶函数,
;
,若
的图象与
的图象的交点分别为
,
,……,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/017368c4fe5d82b461daa09bae240b37.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a00cda4ebde196a46cfb157653cbcce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0957763a0990f21f2d24b1910cb2eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61c388166862b3ccfcc7ca749ebe5949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92860378096f519a8fb276d07dbfabce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc7b73af3dc8b4f5cbf01551ce6f78fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9d4f56dc2eb55aaebcb5dcc125eaf72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b30470a53b058c028630ff06f74709b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/017368c4fe5d82b461daa09bae240b37.png)
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2017-05-26更新
|
726次组卷
|
3卷引用:辽宁省沈阳市2017届高三第三次模拟考试数学(理)试题
名校
8 . 在
中,若
,则
的最大值是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e396233681354261f34b785ac87660b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2592bee3a6fa219b6329b3ad3a3405.png)
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2017-05-26更新
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1587次组卷
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4卷引用:辽宁省葫芦岛市2017届高三第二次模拟考试(5月)数学(理)试题
9 . 已知函数
是
上的偶函数,其图象关于点
对称,且在区间
上是单调函数,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9448bf1d6136b3a108e7ea60506ad39.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8989a873032980db3c9a8596c6004fdd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03bcc5dd0d40df379f0dc9f99c529c85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b77857e15ae11fc94a5e33bfc12d26.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9448bf1d6136b3a108e7ea60506ad39.png)
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2017-05-24更新
|
1202次组卷
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3卷引用:辽宁省重点中学协作体2016-2017学年高一下学期期中考试数学试题
名校
10 . 已知圆
,过点
作直线
交圆
于
两点,分别过
两点作圆的切线,当两条切线相交于点
时,则点
的轨迹方程为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302347fb029954085e83bcbf8e7f3439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f53af1535e285513b6a238c8efc9eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
您最近一年使用:0次
2017-05-12更新
|
676次组卷
|
4卷引用:东北三省三校(哈师大附中、东北师大附中、辽宁省实验中学)2017届高三第三次模拟数学(理)试题