20-21高二·全国·课后作业
1 . 已知安装在一个公共轴上的5个皮带轮的直径成等差数列,其中最大的与最小的皮带轮的直径分别为
与
,求中间3个皮带轮的直径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66e66d5ff831e837398b871441f9479e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c077e21affbe7f9f8bb6d1f57b7e6c59.png)
您最近一年使用:0次
20-21高二·全国·课后作业
2 . 如果
是等差数列,而且正整数
,
,
,
满足
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fb679318d0c9819b82e51a1750b502a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095397b70a73758437ba2198b61fd79b.png)
您最近一年使用:0次
20-21高二·全国·课后作业
解题方法
3 . 在等差数列
中.
(1)
,
,
,求
和
;
(2)
,
,求
和
;
(3)已知
,
,
,求
和
.
(4)已知
,
,
,求
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc2af79f17ef596c04991f4c13cd1955.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/471246f2b8b670bb26900f27801f895c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8000007201d28a54901c28b9feb6f62d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86fc336b4a83bf6d66c4afcc431597f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c350556a0f14aa563211426bc7d3f1be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7da2f386b78cdf6489efaa2f5820d3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c02bc0c74292b1e8f395f90935d3174.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5c1344592c925b273f2cb9b9e47ebbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa2c0c3d44feb1a7e005aeee3cbb3f7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f83602b57c740c22582b205eeb181ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
(4)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e8e9024a5174dc46a934210de90c3db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8438d297ead4350ba719029b0c217c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20287de666fe810d3795a122277600ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
2021高二·全国·专题练习
名校
4 . 如图所示,三个正方形的边AB、BC、CD的长组成等差数列,且AD=21 cm,这三个正方形的面积之和是179 cm2.
![](https://img.xkw.com/dksih/QBM/2021/7/29/2774934622371840/2822992947118080/STEM/26a9a1a0f920465c84169bccbf456817.png?resizew=259)
(1)求AB、BC、CD的长;
(2)以AB、BC、CD的长为等差数列的前三项,以第10项为边长的正方形的面积是多少?
![](https://img.xkw.com/dksih/QBM/2021/7/29/2774934622371840/2822992947118080/STEM/26a9a1a0f920465c84169bccbf456817.png?resizew=259)
(1)求AB、BC、CD的长;
(2)以AB、BC、CD的长为等差数列的前三项,以第10项为边长的正方形的面积是多少?
您最近一年使用:0次
2021-10-05更新
|
226次组卷
|
3卷引用:专题三 等差数列-2020-2021学年高中数学专题题型精讲精练(2019人教B版选择性必修第三册)
(已下线)专题三 等差数列-2020-2021学年高中数学专题题型精讲精练(2019人教B版选择性必修第三册)1.4数列在日常经济生活中的应用检测B卷(综合提升)广西钦州市灵山县那隆中学2022-2023学年高二下学期期中数学试题
2021高二·全国·专题练习
名校
5 . 已知{an},{bn}是两个等差数列,其中a1=3,b1=-3,且a20-b20=6,那么a10-b10的值为( )
A.-6 | B.6 | C.0 | D.10 |
您最近一年使用:0次
2021-10-05更新
|
786次组卷
|
4卷引用: 5.2.1 等差数列(学案)-2020-2021学年高中数学同步备课学案(2019人教B版选择性必修第三册)
(已下线) 5.2.1 等差数列(学案)-2020-2021学年高中数学同步备课学案(2019人教B版选择性必修第三册)湖南省长沙市第一中学2021-2022学年高二上学期12月第二次阶段检测数学试题(已下线)第02讲 等差数列的概念-【帮课堂】2021-2022学年高二数学同步精品讲义(人教A版2019选择性必修第二册)江西省新余市第一中学2021-2022学高二年级下学期开学考试数学(理)试题
解题方法
6 . 将等比数列
按顺序分成1项,2项,4项,…,
项的各组,再将公差为2的等差数列
的各项依次插入各组之间,得到数列
:
,
,
,
,
,
,
,
,
,
,…,数列
的前
项和为
.若
,
,
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9f1ad18371ec533aeac27cf1fad95c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b715e7842b95f654f16056a7c7f2abe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13423c094861baf4b759b7f3d8c3c226.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57483e04fd1840c87ac5325157149877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a548938d87c80ac47910607d3857007f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f6714682274c31a328bf796e235900.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e64fcc69dc28bc11b22f5c9bec9e2aa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86ada2c9f82459340da96274ee60ffbd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c1ccc6c74b8754e9bcbb3f39a11b6f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57ef6d44448092ebdb9e4a49d866a749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e1ee88beaddafb0d0a185c3a8e0dc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf707341083a8aa04dbf8d22a02654e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6505b1b0fd9a30ee9c79e866824e0080.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06fbdd2e3efbef1ff014df55b242eced.png)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
您最近一年使用:0次
解题方法
7 . 已知等差数列
、
、
、![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
①在区间
上,该数列有多少项?并求它们的和;
②在区间
上,该数列有多少项能被
整除?并求它们的和.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88ce87642d4f11148b5d8e65018431b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c942ba8e169307b51c06db4b56a7e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52ed857e43f854552ca346e15164ad7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
①在区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33aac96040b49806b869c3396026adf4.png)
②在区间
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33aac96040b49806b869c3396026adf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d91e07104b699c4012be2d26160976a2.png)
您最近一年使用:0次
名校
解题方法
8 . 下面正确的是( )
A.在等差数列![]() ![]() ![]() ![]() |
B.在等比数列![]() ![]() ![]() ![]() |
C.在等差数列![]() ![]() ![]() |
D.在等比数列![]() ![]() ![]() ![]() |
您最近一年使用:0次
2021-09-16更新
|
281次组卷
|
3卷引用:考点10 等比数列-2022年高考数学一轮复习小题多维练(新高考版)
(已下线)考点10 等比数列-2022年高考数学一轮复习小题多维练(新高考版)江苏省徐州市铜山启星中学2020-2021学年高二上学期第一次质量检测数学试题浙江省金华第一中学2021-2022学年高一领军班下学期期中数学试题
9 . 已知数列
,若_________________.
(1)求数列
的通项公式;
(2)求数列
的前
项和
.
从下列三个条件中任选一个补充在上面的横线上,然后对题目进行求解.
①
;
②
,
,
;
③
,点
,
在斜率是2的直线上.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.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/ba57c83d526ac308d1461e80fcca9f36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
从下列三个条件中任选一个补充在上面的横线上,然后对题目进行求解.
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a0a3a3b9f5c56ee7d299127e5bb2e18.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a0d29f34218cd60cc6e9ce4dcd13925.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bc26be9765b3a81944b3c6623fa20e1.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907f233ffca0f7a337dfa61f401e7bde.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce36b768c1e1caac4f7b240c35dc4217.png)
您最近一年使用:0次
2021-08-25更新
|
2351次组卷
|
11卷引用:广东省阳春市第一中学2022届高三上学期第四次月考数学试题
广东省阳春市第一中学2022届高三上学期第四次月考数学试题山东省济南市莱芜第一中学2021-2022学年高二上学期期末考试数学试题专题13数列(解答题)江苏省镇江市镇江中学2022-2023学年高二上学期期末数学试题(已下线)技巧04 结构不良问题解题策略(5大题型)(练习)广东省韶关市2020-2021学年高二下学期期末数学试题安徽省蚌埠第三中学2021-2022学年高二下学期开学测试数学试题广东省揭阳市揭西县2021-2022学年高二上学期期末数学试题江苏省淮安市涟水县第一中学2022届高三下学期期中数学试题山东省枣庄市市中区2022-2023学年高二上学期期末数学试题湖北省十一校2023届高三下学期第二次联考数学试题
解题方法
10 . 已知数列{
}满足
,
且
=
,n∈
(
是等比数列,
是等差数列),记数列{
}的前n项和为
,{
}的前n项和为
,若公比数q等于公差数d,且![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45cefbb4528036d75c878b002e32037.png)
(1)求数列{
}的通项公式;
(2)记
为数列{
}的前n项和,求
(n≥2,且n∈
)的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cba31e8c939286cafff96e8d715a697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15b313c69a166d9ba8782f7b4f530c0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd578523d92aab4979e0f180a36d9b89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cba31e8c939286cafff96e8d715a697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaac2b4316cf040ad5df264ee6c172d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429e10d8906347b79a562dd8460c8acc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfccafa83afe5ee21eab6ef2b2c8852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e71fd3bd2adc4704035e114536bdb217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bfccafa83afe5ee21eab6ef2b2c8852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e71fd3bd2adc4704035e114536bdb217.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb26cd1601fe7e76e1e2dc0b4909324a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e45cefbb4528036d75c878b002e32037.png)
(1)求数列{
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cba31e8c939286cafff96e8d715a697.png)
(2)记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4079407811e6021aedbf404d1839a36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cba31e8c939286cafff96e8d715a697.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae7525cf9ff41846201a925db9a7e682.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429e10d8906347b79a562dd8460c8acc.png)
您最近一年使用:0次