如图,
是面积为1的等腰直角三角形,记
的中点为
,以
为直角边第一次构造等腰
,记
的中点为
,以
为直角边第二次构造等腰
,…,以此类推,当第n次构造的等腰
的直角边
所构成的向量
与
同向时,构造停止,则构造出的所有等腰直角三角形的面积之和为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cabe764f05300ac83c7d16b685d27af4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8d31fd28a35ede33f968197448e7258.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3b9e816b14051f785aa5aae72b8eed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eae3a47e231dcbb00667109b40722bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcb69644700fe51b91bb0fd157f767f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdf547f77ad717db8b7f24030856d39e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64ccec21c6be46a38f10cecfbde1dfc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b77fdb6ec2eea3ecd7a67521edb79e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a34bf00aeba15bce2cdee8ab487388dc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/2f1908a2-7eea-4c72-b893-b01614db91f8.png?resizew=169)
更新时间:2022-11-28 23:54:54
|
【知识点】 求等比数列前n项和
相似题推荐
填空题-单空题
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适中
(0.65)
【推荐1】将正整数排成如图所示的数阵,其中第k行有
个数,如果2023是表中第m行的第n个数,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934d37c81b2266c7b86bcc11afaf5f91.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98aa5f1acb67ec4580d240c2525e4d5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/934d37c81b2266c7b86bcc11afaf5f91.png)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 … |
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐2】已知公差为正数的等差数列
的前n项和为
,
是等比数列,且
,
,则
的最小项是第______ 项.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76aef4cdcb5af742ce28003b7b6c8c20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f329b217e1051b23f0d61023cdc6e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f11a56cf817430f1e54c4ec06537848.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fc5ecce3e02d809a8d4efe2dd8e5fce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdcd551bc3ae5b68470b9656178b8847.png)
您最近一年使用:0次