已知数列
中,
中,
(n∈N*)中,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
________ ,
________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a726fa11f0b1173fadcc2c9dc834c8b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42e4487468ab2823d6dbf7f0ebd2eb38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
18-19高一下·浙江杭州·期中 查看更多[3]
更新时间:2022-08-23 11:02:28
|
相似题推荐
填空题-单空题
|
适中
(0.65)
名校
【推荐1】将全体正偶数排成一个三角形数阵:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/0ffbd305-07e9-43a2-81ab-e53f391b9b4d.png?resizew=151)
根据以上排列规律,数阵中第
行的从左至右的第3个数是__________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/11/0ffbd305-07e9-43a2-81ab-e53f391b9b4d.png?resizew=151)
根据以上排列规律,数阵中第
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8715a3f984d2627afd7c40c61347b7cb.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐2】已知等差数列
的前n项和为
,且
,
.数列
的首项为3,且
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33da2a751a63f8946c11234ed55dab2b.png)
________ .
![](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/d5ef35b21da4cd8130642539d8245f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7af9d6941ab0cc5d87c8f20a19385034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06ea92902980c21bc18f5c68f316f559.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33da2a751a63f8946c11234ed55dab2b.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐1】两千多年前,古希腊毕达哥拉斯学派的数学家曾经在沙滩上研究数学问题,他们在沙滩上画点或用小石子来表示数,按照点或小石子能排列的形状对数进行分类,如图实心点个数1,5,12,22,…,被称为五角形数,其中第1个五角形数记作
,第2个五角形数记作
,第3个五角形数记作
,第4个五角形数记作
,…,第
个五角形数记作
,已知
,则前
个五角形数中,实心点的总数为__________ .[参考公式:
]
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1928c254cfada1f75a5cd1e34db5a63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0939caf47d751f8c7139bd0b25fe98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5202b28df649fd77f8fa2891e8d36322.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/b565a322d7bebac34c308f35f8224ed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/314ff1b297c2bb46771d8284f7343cbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/4e905e22-6084-4355-89f5-f32aa4902622.png?resizew=333)
您最近一年使用:0次
填空题-双空题
|
适中
(0.65)
解题方法
【推荐2】某少数民族的刺绣有着悠久的历史,如图(a)~(d)为她们的刺绣中最简单的四个图案,这些图案都由小正方形构成,小正方形数量越多,刺绣越漂亮.现按相同的规律刺绣(小正方形摆放的规律相同),设第n个图形包含
个小正方形.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1580872d29c1b713366ad6fd40c13f6.png)
______ ;
的表达式为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1580872d29c1b713366ad6fd40c13f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/24/4ffe3546-d595-43ce-95cb-f64b0ea73cf0.png?resizew=322)
您最近一年使用:0次
填空题-双空题
|
适中
(0.65)
名校
【推荐1】如图的形状出现在南宋数学家杨辉所著的《详解九章算法·商功》中,后人称为“三角垛”.“三角垛”的最上层有1个球,第二层有3个球,第三层有6个球……设各层球数构成一个数列
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
______ ,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dbd9ff686703cad03aa383e5fec21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/9431378e-8abb-499b-a3f2-54f0d118f292.png?resizew=168)
您最近一年使用:0次
【推荐2】在数列
中,已知
,
,则数列
的前2024项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780019495df34d40fff9d8f31bbf3e74.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea8d0e50065114b05ef2dc1ea1129cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e7a29b69f016096788a66eb583e66dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780019495df34d40fff9d8f31bbf3e74.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐1】已知
是数列
的前
项和,若
,
,
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef858df390b72f83c029d15ba8fd5133.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b708c8dcb2d66eb2ce0b3718a9cd924a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/663bbc5767b9cb453cb08e1f0a8e0602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03525ebb85462015e996e7c6f41354cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb8c29b297e3ec337c3139c2a1ebed1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef858df390b72f83c029d15ba8fd5133.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐2】在平行四边形ABCD中,点E满足
,连接AE并延长交BC的延长线于点F,
,若数列
是等差数列,其前n项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e4b5a382f920203b9ef307224ae641e.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615a5a804704b4c4e97cbd9f84957fbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef66d78d444513802a3e82f46504944e.png)
![](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/4e4b5a382f920203b9ef307224ae641e.png)
您最近一年使用:0次