设
表示数列
的前
项和,已知
,若
是等比数列,则公比![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0d99fef1aa4dbcc6dc7b30b7d2c9a9.png)
__________ ;若
是等差数列,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0675050bc7377c6056b0e62b2570fc1.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](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/0eabb3e5ff574b8cd7d0bd32d6f5b5f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad0d99fef1aa4dbcc6dc7b30b7d2c9a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0675050bc7377c6056b0e62b2570fc1.png)
更新时间:2017-08-15 21:57:57
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相似题推荐
填空题-单空题
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适中
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名校
【推荐1】在等差数列
中,其前
项和为
,已知
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4462061849841442375508b195ca26df.png)
__________ .
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86c7cef22e6e75c4989057b36bdc83ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039ede15004ad4c8095fa60b4a95ed13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4462061849841442375508b195ca26df.png)
您最近一年使用:0次
填空题-单空题
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适中
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【推荐2】下面有四个命题:
①函数
的最小正周期是
;
②
;
③把函数
的图象向右平移
个单位长度得到
的图象;
④等差数列
的前
项和为
,前
项和为
,则它的前
项和为
.
其中真命题的编号是__________ (写出所有真命题的编号).
①函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d8e4f5b3c0bc0c9a968e9eec375b66a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66e4aba29f9ea1def071a7370c26781.png)
③把函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/596a7dd8d0e306f484c4979e037ae9f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037fb348109dc2063a268b10eb925a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36c191fdfd08fb94ba6ed45c71f0fbeb.png)
④等差数列
![](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/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fad491e5b5e14c49ef8b7004ebcfcef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0efba7147f5b9ced8bc4a72f0a9fb8af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ade9841a8e6840efddcfd8620a6fc1fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca15cd772284da8cf1899d388df3a8c.png)
其中真命题的编号是
您最近一年使用:0次
【推荐1】已知正项等比数列
的前
项和为
,
,
,则数列
中不超过2021的所有项的和为___________ .
![](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)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87d85252ec30a427151f300503e3024d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/471584358a4c23a08378b2d8fa02c8c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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解题方法
【推荐2】“杨辉三角”是我国数学史上的一个伟大成就,是二项式系数在三角形中的一种几何排列.如图所示,第
行的数字之和为__________ ,去除所有1的项,依次构成数列2,3,3,4,6,4,5,10,10,5,…,则此数列的前28项和为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99ea0a42b10626bb77a40f2ef8a7cad6.png)
![](https://img.xkw.com/dksih/QBM/2022/5/26/2987763684597760/2987947077632000/STEM/5cb3de39-f5e2-41cd-812e-e2ea2c9d2c92.png?resizew=194)
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