名校
解题方法
1 . 在如图所示的表格中填写
,
,
三个数字,要求每一行、每一列均有这
个数字,则不同的填法种数为( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
2 . 等比数列的历史由来已久,我国古代数学文献《孙子算经》、《九章算术》、《算法统宗》中都有相关问题的记载.现在我们不仅可以通过代数计算来研究等比数列,还可以构造出等比数列的图象,从图形的角度更为直观的认识它.以前n项和为
,且
,
的等比数列
为例,先画出直线OQ:
,并确定x轴上一点
,过点
作y轴的平行线,交直线OQ于点
,则
.再过点
作平行于x轴,长度等于
的线段
,……,不断重复上述步骤,可以得到点列
,
和
.下列说法错误的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/390636a89883bd64bf8da9bf8654aff9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ca664b1e82da6f50064a76fe118aa80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994caea91364fb41a5b6bbc4a75f5395.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc2326cb86431ec57dededd7c9ed60a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c75efc5363537ea49449cd75ae729ef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2708fa6298e52f617383efc175b71ddc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2e6db493ca4e8efd9722ee21125689.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c226c60b851cbf6d6c3361cac53bb049.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c5a325806df1a1c3e7ce609fe99085f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ada1e6800ad9d452585f9a6cf1ab7ef9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/621604766ddd141c86e37da5e71aef26.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/3/0275bf1e-282d-43e5-b78b-28db1e2870a5.png?resizew=258)
A.![]() | B.![]() |
C.点![]() ![]() | D.![]() |
您最近一年使用:0次