1 . 下列各式中S的值不能用算法求解的是_____ .
①S=13+23+33+43+…+1003;
②S=
+
+
+
+…+
;
③S=1+2+3+4+5+…;
④S=1-2+3-4+5-6+…+99-100.
①S=13+23+33+43+…+1003;
②S=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d266a04f3dc7483eddbc26c5e487db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3ffd5c35bba71ea54c28622b6cf505d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ebbdd9dbf477a7e71688cf5fb76f2cc.png)
③S=1+2+3+4+5+…;
④S=1-2+3-4+5-6+…+99-100.
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2 . 计算下列各式中的值,能设计算法求解的是______ .
①
;
②
;
③
(
,且
).
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3dfa9a16aaf8e39b53e91d8c7c0e41a.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54e82a5581b18a5f073a6a2333dcc87.png)
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf0de4330ee4923aa13574b71f47ce08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0704f453b2de48d36911f7db496bbf82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac69e6db1df13ed64756b4f391ae9fac.png)
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