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)
更新时间:2017-04-27 22:26:29
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相似题推荐
填空题-单空题
|
适中
(0.65)
解题方法
【推荐1】已知数列
满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb7147e313f9d9f67d19ecb5f499c05.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/008db1b33ca9947927b7076e94c8f2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bb7147e313f9d9f67d19ecb5f499c05.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐1】设
为等差数列
的前
项和,已知
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4e70b360f988fdbd92300ab22c4613.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/9f4e788a36d8103e12e3200b757f0609.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc4e70b360f988fdbd92300ab22c4613.png)
您最近一年使用:0次
【推荐2】
为不超过
的最大整数,设
为函数
的值域中所有元素的个数.若数列
的前
项和为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5af1f1b7e9e20d799ee3c06b89a0611c.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96abfe2da27a63e6affb19a0c80236d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9334d1302148b11151bbd2dac9df2ba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fd528794eeb02c09998021d05f116c4.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/5af1f1b7e9e20d799ee3c06b89a0611c.png)
您最近一年使用:0次