解题方法
1 . 已知等差数列
满足
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11fd68ba305e729f9ea2e60a5a3cc781.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
您最近一年使用:0次
2 . 传说古希腊毕达哥拉斯学派的数学家常用小石子来研究数.他们根据小石子所排列的形状把数分成许多类,如图(1)可得到三角形数1,3,6,10,…,图(2)可得到四边形数1,4,9,16,…,图(3)可得到五边形数1,5,12,22,…,图(4)可得到六边形数1,6,15,28,….进一步可得,六边形数的通项公式![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
______ ,前n项和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
______ .
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898521846890496/2899266842533888/STEM/72310aef-a41f-42af-b811-5e94e5a95c36.png?resizew=510)
(参考公式:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c2864e2ec3416cc4c081ac1f71a0af.png)
![](https://img.xkw.com/dksih/QBM/2022/1/20/2898521846890496/2899266842533888/STEM/72310aef-a41f-42af-b811-5e94e5a95c36.png?resizew=510)
(参考公式:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f2bd63beff7b006ce7867e71a2994ca.png)
您最近一年使用:0次
2022-01-21更新
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566次组卷
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4卷引用:浙江省台州市2021-2022学年高二上学期期末数学试题
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