等差数列
中,
其前n项和
,则n=__
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6911b74476439086d6f3a1d1e66ec0e8.png)
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10-11高三上·山东临沂·期中 查看更多[3]
(已下线)2011届山东省临沂市高三上学期期中考试文科数学卷河南省信阳市息县第一高级中学2019-2020学年高二上学期第二次阶段性考试数学(文)试题(已下线)4.2.2 等差数列的前n项和公式(第1课时)(练习)-2020-2021学年上学期高二数学同步精品课堂(新教材人教版选择性必修第二册)
更新时间:2016-11-30 11:30:51
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【推荐1】在坐标平面内横纵坐标均为整数的点称为格点.现有一只蚂蚁从坐标平面的原点
出发,按如下线路沿顺时针方向爬过格点:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/295492fc0519118488a5efabdf2afd7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91cf6590154c8e47b658762dbc7f8dba.png)
,则蚂蚁在爬行过程中经过的第114个格点
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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【推荐2】已知数列
的通项公式
,在数列
的任意相邻两项
与
之间插入
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,记新数列
的前n项和为
,则
的值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaedbe3a497ce47eadaac5fcdef44900.png)
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【推荐1】已知等差数列
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__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
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【推荐2】由正整数组成的数对按规律排列如下:
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.若数对
满足
,则数对
排在第_______ 位.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45a2f06fb0027c961b32cbb1fcf21958.png)
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