1 . 若数列
满足
,
,则使得
的正整数
的数目为( )个.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb93df462dde10cc60418cbccaaeb38.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16c8d0474f7d81ef8dbefaacfd5afe7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea53c334b2d633d73489f95cd4e57841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/596f7c59b0df339616870dde35061191.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.0 | B.1 | C.2 | D.大于2 |
您最近一年使用:0次
2 . 数列
、
满足
,
,
,
.则
的值为______ (
表示不超过实数
的最大整数).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/034ba25825c13725931c483aa47c9363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385275d29d8c8a7841eaeaa3dfab2cdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87285cb2d33c9e0e547259954661c49d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6806e145b1e6c0b7c1b74cdf6097070f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3612a0ba668c30d5097c0a1122f9b11d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
A.0 | B.1 | C.2 | D.大于2 |