名校
解题方法
1 . 设等差数列
的前
项和为
,则有以下四个结论:
①若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99ca47be5a21ea60ebd04dd8945852d8.png)
②若
,且
,则
且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eef1f2c439ad1043f4b0e8892066826.png)
③若
,且在前16项中,偶数项的和与奇数项的和之比为3:1,则公差为2
④若
,且
,则
和
均是
的最大值
其中正确命题的序号为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd67cf18bd35149475d35f1c603ad59.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99ca47be5a21ea60ebd04dd8945852d8.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45c65fa15317b33766389407c427668.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/642a443e3315a7fb6489b01fad7e3215.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd3c579e5e0540f190994cbb5b0653a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6eef1f2c439ad1043f4b0e8892066826.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8bdb404dcbe74cd8bbd30de782a8fa.png)
④若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8933c07e3651731291184c080766c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c41c4154f019120be078200f2dff6f4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f30f56664446f32dbbc2c5f12a99374.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
其中正确命题的序号为
您最近一年使用:0次
2023-11-26更新
|
505次组卷
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5卷引用:宁夏银川市唐徕中学2023-2024学年高三上学期期中考试数学(理)试题
宁夏银川市唐徕中学2023-2024学年高三上学期期中考试数学(理)试题北京朝阳区六校联考2024届高三12月阶段性诊断数学试题北京第五中学2023-2024学年高三下学期开学检测数学试卷(已下线)2024年高考数学二轮复习测试卷(北京专用)(已下线)4.2.2 等差数列的前n项和公式——课后作业(提升版)
名校
2 . 2021年夏天由于用电量增多,某市政府鼓励居民节约用电,为了解居民用电情况,在某小区随机抽查了20户家庭的日用电量,结果如下表:
则关于这20户家庭的日用电量,下列说法:①中位数是6度;②平均数是6度;③众数是6度;④极差是4度;⑤方差是
.其中说法错误的序号是___________ .
日用电量(度) | 4 | 5 | 6 | 8 | 9 |
户数 | 4 | 4 | 7 | 3 | 2 |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/533a7b702ada1dd80123e4041271d521.png)
您最近一年使用:0次
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3 . 给出下列五种说法:
(1)方程
有两解.
(2)若函数
是函数
的反函数,且
,则
.
(3)三棱锥
中,
,
,
,则二面角
的大小为
.
(4)已知函数
为
上的奇函数,当
时,
.若
,则实数
.
(5)若
在定义域
上是减函数,且
,则实数
.
其中正确说法的序号是___________ .
(1)方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e54b86dc68561ab469c513e0141d53c0.png)
(2)若函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942c2141d01bde6b48210c56a17fc75e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d018d0b5d1970404a82d6dc0d5e1771c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ed8aaba239ea86b3fb0240c746e60c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
(3)三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a94d59dee2d5a8f0425b64b2083825.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/feecac926fdb10406e0087bbfc6461d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/077c956ac0eb05cf120e14f17413dfa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1385c59d0fe2bc62fed70a2d13a5e956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5768a8d6630375daf58e971fa200c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
(4)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09f86f37ec8e15846bd731ab4fcdbacd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3ed15aa3dcc4211fb520b5b942c989.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6e2e79843faf62dde86bf858d1e0569.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79f4793c5a67e157702ab4cda34bef36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/964642e40e5b625ec06a050bfceb6f21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b108ab31cc093f03cf48ad65429889e.png)
(5)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51c530f4b7491b95acb8ce3eef9aa09d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/455ba3d3e46977fcbe5b71f8bb9df4be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0afb20979bd3e8af9a9a2773db7e72a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d29d10427f79bb2a53344f2f3c64f59c.png)
其中正确说法的序号是
您最近一年使用:0次
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解题方法
4 . 函数
的定义域为R,其图像是一条连续的曲线,
在
上单调递增,且
为偶函数,
为奇函数,则下列说法中,正确说法的序号是__________ .
①
既不是奇函数也不是偶函数;
②
的最小正周期为4;
③
在
上单调递减;
④
是
的一个最大值;
⑤
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb788ae88e457017bb81120b6a2e5ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb788ae88e457017bb81120b6a2e5ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304226ca50149b49702928e44d565964.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e81e15b871dd32b2438ef8025bcc42d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a616b9cc7d9b4a0a0955762154e320a9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb788ae88e457017bb81120b6a2e5ee.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb788ae88e457017bb81120b6a2e5ee.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb788ae88e457017bb81120b6a2e5ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abc448f5765b01ab4b05740d5f8854ee.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0af39d972b8ddf96242d2a6e4a723f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cb788ae88e457017bb81120b6a2e5ee.png)
⑤
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4fb4761431ca06264696fe063c32dc.png)
您最近一年使用:0次
2023-07-25更新
|
695次组卷
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7卷引用:宁夏回族自治区石嘴山市平罗中学2022-2023学年高二下学期期末考试数学(理)试题(A卷)
宁夏回族自治区石嘴山市平罗中学2022-2023学年高二下学期期末考试数学(理)试题(A卷)黑龙江省佳木斯市第一中学2023-2024学年高三上学期第二次调研考试数学试题(已下线)高一上学期期中数学试卷(提高篇)-举一反三系列(已下线)高一上学期期中考试填空题压轴题50题专练-举一反三系列福建省莆田市第九中学2023-2024学年高一上学期期中检测数学试题(已下线)高一上学期期末考试填空题压轴题50题专练-举一反三系列山东省德州市万隆中英文高级中学2023-2024学年高二下学期6月月考数学试题