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解题方法
1 . 已知数列
的通项公式为
,其中常数
.
(1)若
,求
的值;
(2)若
前10项的和为1551,试分析
的单调性;
(3)对于常数t,记集合
,试求当
与t变化时,集合
中元素个数的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b46c01a94b7d89f7b868106026626d09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b8e5990ef4ef314941a3154457a9d4.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef48decc62a3062c1cd0ea4c95c17a28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
(3)对于常数t,记集合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c2a1ba529e3a2c2047cdc6f9494bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/614e153312f97a2e6c30e94abd760bee.png)
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