1 . 若
为
的各位数字之和,如:
,
,则
;记
,
,
,…,
,
,则
( ).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38fcec7af3520884b173b29bda6c657a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee58b7cf0449b1e437b5b0db3dd5132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ee0e161c98bbc04299df0661ab24434.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a76beb048182bf1257db4301f5659741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b6f64f96fc7031a474bf7d436bdac01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e092d0b6b216c67ad98e558504cb2753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8502b8308c45d8ed61894059a8bffa18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00d7b1b5ab3dac402d6dab3ec55bdeba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4ba2605236afc5f137664bb4f9938f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b08c58baacec3cd0c0a06e267fa9ec5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f0812e6728f464221cf6adc42c7c778.png)
A.2 | B.8 | C.5 | D.11 |
您最近一年使用:0次
2 . 设数列{an}满足:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0967fa6553dfe8d1952c35668a3017f9.png)
其中[x]表示不超过实数x的最大整数(例如
则
的个位数字是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0967fa6553dfe8d1952c35668a3017f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7261a653b3b6a3e0247edd5d15de768b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2d525fd1f8925a3a1499e946cb9aaf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1a50f815f27b1c935fe28935cb2d3ff.png)
A.3 | B.5 | C.7 | D.9 |
您最近一年使用:0次