如图所示,图案都由小正方形构成,规律如下:设第n个图形包含
个小正方形,若
对任意
都成立,则实数a的最小值为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d4fc8faefb26b233d4aa9dbef043aae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f8946e9de63e3afcac7af5d9b65f52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://img.xkw.com/dksih/QBM/2020/10/10/2568002351415296/2568033512505344/STEM/5a558236-0077-4467-9f0e-877b73622efe.png)
更新时间:2020-10-10 15:40:28
|
相似题推荐
【推荐1】传说古希腊毕达哥拉斯学派的数学家常用小石子来研究数.他们根据小石子所排列的形状把数分成许多类,如图(1)可得到三角形数1,3,6,10,…,图(2)可得到四边形数1,4,9,16,…,图(3)可得到五边形数1,5,12,22,…,图(4)可得到六边形数1,6,15,28,….进一步可得,六边形数的通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ ,前n项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
______ .
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898521846890496/2899266842533888/STEM/72310aef-a41f-42af-b811-5e94e5a95c36.png?resizew=510)
(参考公式:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898521846890496/2899266842533888/STEM/72310aef-a41f-42af-b811-5e94e5a95c36.png?resizew=510)
(参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2bd63beff7b006ce7867e71a2994ca.png)
您最近一年使用:0次
【推荐2】设数列
满足
,
,且
,若
表示不超过
的最大整数,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad0fdb7d52d332776e8d4c6126d3b57.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7def23f30138e0b7c4c1e498d6903a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50feb194b3a7cd2e437e15e0f6e2c3b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fab6009ffb15a88bd843a1c2b8d7770.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aad0fdb7d52d332776e8d4c6126d3b57.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐1】数列
的通项公式
,若前
项的和为10,则项数
为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c5034a6a8063b7547521fec1cabeda0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐2】在数列
中,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8afd794c47fc85580422e83edc31bc31.png)
,设
,
是数列
的前
项和,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa51f6cc47226d263066c511e7cba05d.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63d471926f7b27322d90c82b9ce21d3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49d2b2d4f703cbaa738a7cdfc7129c17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8afd794c47fc85580422e83edc31bc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/289304d0182c0234b74dcb8c8fb708da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced14d4c6f45e196e159caa515fb6c29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce83115a50f99e08e9a2db7267aeed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa51f6cc47226d263066c511e7cba05d.png)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
【推荐1】下列各图是由一些火柴棒拼成的一系列图形,如第一个图中有4根火柴棒组成,第二个图中有7个火柴棒组成,第三个图中有10个火柴棒组成,按这种规律排列下去,那么在第51个图中的火柴棒有_________ 个
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131424182272/1570131429171200/STEM/1039e71f499a4d31a76aa882b145bc44.png?resizew=47)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131424182272/1570131429171200/STEM/d850ab94e40346e494c538cbadbbe4cf.png?resizew=85)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131424182272/1570131429171200/STEM/4c31de7d9d4c444cb6b1d3e3bb529bad.png?resizew=127)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131424182272/1570131429171200/STEM/1039e71f499a4d31a76aa882b145bc44.png?resizew=47)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131424182272/1570131429171200/STEM/d850ab94e40346e494c538cbadbbe4cf.png?resizew=85)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131424182272/1570131429171200/STEM/4c31de7d9d4c444cb6b1d3e3bb529bad.png?resizew=127)
![](https://img.xkw.com/dksih/QBM/2011/4/26/1570131424182272/1570131429171200/STEM/f6518b7494034e98ab91fb1473910980.png?resizew=166)
您最近一年使用:0次
填空题-单空题
|
适中
(0.65)
名校
【推荐2】下面由火柴棒拼出的一列图形中,第
个图形由
个正方形组成.
通过观察可以发现第10个图形中火柴棒的根数是 ________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/092c076b-069b-46e3-baba-089d1b872b81.png?resizew=347)
您最近一年使用:0次