1 . 已知数列
的各项均为正整数,设集合
,
,记
的元素个数为
.
(1)若数列A:1,3,5,7,求集合
,并写出
的值;
(2)若
是递减数列,求证:“
”的充要条件是“
为等差数列”;
(3)已知数列
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7f885247785940c5c849210fb6f8abc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4884c506476f191d7919cd266c8c0212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47a0c2bb484bf523189b093485eca999.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1ff5cb5a9d88ed7db2c06683c3e355.png)
(1)若数列A:1,3,5,7,求集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b68df477b3ee45ac0f725db00d465a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c1ff5cb5a9d88ed7db2c06683c3e355.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3197c615558fee3993d2a8deb9091f0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(3)已知数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d509697c5391a7c24d9bbc2c82422b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ff241fc46c23ac975c5b39e87a9e46a.png)
您最近一年使用:0次
2024-04-19更新
|
324次组卷
|
3卷引用:黑龙江省双鸭山市友谊县高级中学2024届高三下学期高考模拟(一)数学试题
黑龙江省双鸭山市友谊县高级中学2024届高三下学期高考模拟(一)数学试题吉林省长春市长春吉大附中实验学校2023-2024学年高二下学期5月期中考试数学试卷(已下线)2024年北京高考数学真题平行卷(基础)
名校
解题方法
2 . 在
中,内角
的对边分别是
,且
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5742b2684d00be50a66e01c9acb6b51f.png)
(1)求角
;
(2)若
,求边
上的角平分线
长.
![](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/4f4433dbcaa6fa08b22b92d2d224cf29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5742b2684d00be50a66e01c9acb6b51f.png)
(1)求角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e658a5aee39ea75e9076aed714ee451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
您最近一年使用:0次
名校
解题方法
3 . 在
中,内角
的对边分别是
,且
.
(1)求角A;
(2)若
为锐角三角形,求
的取值范围.
![](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/8bc66e5cacfca2e3e3604bf1ffee51dd.png)
(1)求角A;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88cfe0e7f21fff2c0d92f8ccf3e58e3.png)
您最近一年使用:0次
名校
解题方法
4 . 在
中,角
的对边分别为
,且
.
(1)证明:
为直角三角形;
(2)当
时,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/e0654ca0f7c6ea6ad8a0a4875befda3f.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)当
![](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
名校
5 . 已知
内角
的对边分别为
为
的重心,
,则( )
![](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/8339f9ff0cbbdb61656612f7309dedb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/401e00ca98b5e75b60d05c3f85ceddc7.png)
A.![]() | B.![]() |
C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
2024-04-17更新
|
1980次组卷
|
7卷引用:黑龙江省大庆市实验中学实验二部2024届高三下学期得分训练数学试题(六)
黑龙江省大庆市实验中学实验二部2024届高三下学期得分训练数学试题(六)广西2024届高三4月模拟考试数学试卷河北省邢台市2024届高三下学期教学质量检测(一)数学试题(已下线)高一 模块3 专题1 第3套 小题进阶提升练 【人教B版】(已下线)高一 模块3 专题1 第3套 小题进阶提升练【北师大版】广东省揭阳市2024届高三下学期二模考试数学试题河南省信阳高级中学2023-2024学年高一下学期5月期中测试数学试题(二)
6 . 已知函数
,正数
满足
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dc4681338d11e46b19a83d89b0f608a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fc04101350b2aa067abbbdda0946de7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900cfd62bfc87dd3000a65963fce54b2.png)
A.6 | B.8 | C.12 | D.24 |
您最近一年使用:0次
2024-04-17更新
|
1828次组卷
|
3卷引用:东北三省四市教研联合体2024届高考模拟(一)数学试卷
名校
7 . 已知
,
,
,函数
,且
在区间
上的最大值为
.
(1)求m的值;
(2)锐角
中,角A,B,C所对的边分别为a,b,c,若
且
,求
的周长l的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/323be9061cb126865dc01d7e18b4fec6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32f1b9a5de4299f090439b63377d8eb0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40e72f6b2ef3329828cb8fc873eeba7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26b4fa6a80a7c756dfff36e9245beed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b7b01d6ed3ad5d150f13dfc06485ea9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(1)求m的值;
(2)锐角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e8d0f52ecdd034a595c35e8573809ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03837b3769eda7f0d3804cc5ad4a6d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
您最近一年使用:0次
名校
8 . 已知半圆O的半径为1,A为直径延长线上的点,且
,B为半圆上任意一点,以
为一边作等边
,设
.
时,求四边形
的周长;
(2)托勒密所著《天文集》中涉及如下定理:任意凸四边形中,两条对角线的乘积不大于两组对边乘积之和,当且仅当对角互补时取等号.据以上材料,当线段
的长取最大值时,求
;
(3)当
为何值时,四边形
的面积最大,并求此时面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eec6ce73c6786d50028addff089bbb64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff2f9c83969db11c73464434cd1a5bd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea16ceca816f7d3d50650af141baf42.png)
(2)托勒密所著《天文集》中涉及如下定理:任意凸四边形中,两条对角线的乘积不大于两组对边乘积之和,当且仅当对角互补时取等号.据以上材料,当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fed1f57a835af4e9022e27603d12d31.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea16ceca816f7d3d50650af141baf42.png)
您最近一年使用:0次
名校
9 . 已知点M是
所在平面内一点,点O、H分别是
的外心、垂心,下列命题中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.若![]() ![]() |
B.若![]() ![]() ![]() ![]() |
C.![]() ![]() |
D.若![]() ![]() ![]() ![]() |
您最近一年使用:0次
名校
10 . 已知两个等差数列
和
的前
项和分别为
和
,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa1f959646f47d0b32bfa6a3411ae55f.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3cfeacc29e6a61c5b3b4e439c0a91df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63f5c583c98a1fd516c6ceaa60b55dec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc0c111a1e0d9278ae6c129e199c2ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa1f959646f47d0b32bfa6a3411ae55f.png)
您最近一年使用:0次
2024-04-15更新
|
476次组卷
|
2卷引用:黑龙江省大庆市大庆中学2023-2024学年高二下学期4月月考数学试题