已知数列
的前
项和
满足:
且数列
最小项为
.
(1)求
的取值范围;
(2)若
,设
,
是数列
的前
项和,求
的前15项和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28ef6f1b2279af482557a8ea46f2e43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998e4ae57c2ccc58d91ee9e7dd83317e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21987e8cb32af969efd72fdf0a805c5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddbf8f65ac61cbe357601a1dee2023d.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9faeed172ec5b88966b0d1c52748d41.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a79b02f4ac77c07b8fa9828b6b4ed3a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3f5fd27adb5962398e7c91bf92ab90b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1ae9a3b0b7aeb1545b65d91aa371b3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a425978da20cebf8c4c63953579e7b35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/195431ccf2756a0db26f14b7b91a32a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d543b08a9290e9297b9359e0be706aa.png)
更新时间:2022-10-20 11:15:53
|
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名校
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eed39c7d611309b01476c15ab242308.png)
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