1 . 在三棱锥
中,
,
,
,
为
的中点,则异面直线
与
所成角的余弦值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29e240a6378adf6d23ebf9cc710c9bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa7aeb2a8d1437eeb4482c3b6ad9f315.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb322e81e7d2a672a901039600962316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
您最近一年使用:0次
2024-06-12更新
|
770次组卷
|
3卷引用:艺体生押题卷二
名校
解题方法
2 . 抛掷一枚不均匀的硬币,正面向上的概率为
,反面向上的概率为
,记
次抛掷后得到偶数次正面向上的概率为
,则数列
的通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b2a698891d42c70b597f0da4f215f09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
您最近一年使用:0次
2024-06-12更新
|
773次组卷
|
5卷引用:河南省郑州市2024届高三第三次质量预测数学试题
河南省郑州市2024届高三第三次质量预测数学试题(已下线)第四套 艺体生新高考全真模拟 (三模重组卷)河南省许昌市许昌高级中学2024届高三下学期三模数学试题云南省昆明市第三中学2024届高三下学期高考考前检测数学试卷(已下线)第4套 新高考全真模拟卷(三模重组)
3 . 已知数列
满足
,
,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/651b05c4f2f3f750c2c77f0f4dd90245.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316a061744ea8475205205a19afd2b36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b8d88cc1059a7b6d79944f5fcda983.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc41a964cee9cff69c3b805afd29f086.png)
A.512 | B.678 | C.1010 | D.1022 |
您最近一年使用:0次
2024-06-11更新
|
600次组卷
|
5卷引用:高三数学考前押题卷3
(已下线)高三数学考前押题卷3(已下线)安徽省合肥市第一中学2024届高三下学期三模数学试题2024届普通高招全国统一考试临考预测押题密卷数学试题(A卷)(已下线)【人教A版(2019)】高二下学期期末模拟测试A卷吉林省通化市梅河口市第五中学2024届高三三模数学试题
名校
解题方法
4 . 记
的内角
的对边分别为
,已知![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c32540dd35e216215b44ce3e03d8368.png)
(1)试判断
的形状;
(2)若
,求
周长的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c32540dd35e216215b44ce3e03d8368.png)
(1)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4580cc037c0c760c728cdbb74a8154c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2024-06-11更新
|
1885次组卷
|
5卷引用:第五套 艺体生新高考全真模拟 (二模重组卷)
解题方法
5 . 在△ABC中,内角A,B,C所对的边分别为a,b,c,
,且
,则△ABC周长的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8391a30a191b22e483db135fd476cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fa1bf739b98363657e0c2dda6e545b.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
解题方法
6 . 已知数列
的前n项和为
,且
,
.
(1)求数列
的通项公式;
(2)求数列
的前n项和为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ff8cb0fc5de578e57b64b58d7215594.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68940f31a3da0df0988b3687e6859236.png)
(1)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(2)求数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d22c28e82a93e04a6dfff80448c7e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
您最近一年使用:0次
解题方法
7 . 已知锐角
的三个内角
,
,
的对边分别是
,
,
,且
的面积为
.则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2399f71125b424fd17c5da2ae796e5ce.png)
A.![]() |
B.![]() ![]() |
C.若![]() ![]() |
D.若![]() ![]() ![]() |
您最近一年使用:0次
2024-06-07更新
|
743次组卷
|
4卷引用:第六套 艺体生新高考全真模拟 (二模重组卷)
8 . 已知数列
的前n项和为
,若
,
,且
,
都有
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/315b41eeea0dbaa395af2474c4ba6acb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c68b253787b7980d259a243ee42ecfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f093c61867ee4ce75f951d46b9b123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa0d7e6c9c370ca8d040f6b4b40cee90.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
名校
解题方法
9 . 在
中,内角
的对边分别为
,且
.
(1)证明:
.
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b51b6c5ef6143eaba150e2828613348e.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85d5b1b24e2d918646afd0e16e119698.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08ce80e91fdf435a8e3ec05be990e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/17d7bb7bde8a6f08ad26d2e86cba4b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
2024-06-06更新
|
1641次组卷
|
5卷引用:第四套 艺体生新高考全真模拟 (三模重组卷)
(已下线)第四套 艺体生新高考全真模拟 (三模重组卷)湖南省长沙市长郡中学2024届高三下学期模拟(三)数学试题福建省莆田市2024届高三第四次教学质量检测(三模)数学试题(已下线)专题02 第六章 解三角形及其应用-期末考点大串讲(人教A版2019必修第二册)(已下线)山东省淄博实验中学2024届高三下学期第三次模拟考试数学试题
2024·全国·模拟预测
解题方法
10 . 已知锐角三角形
的内角
的对边分别为
,若
,则
的取值范围是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08e352b30d0f60ba514b3125cedad057.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2122e3f1e76a635e58e4d54aa594c552.png)
您最近一年使用:0次