在等差数列
中,
,
,求
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a0313eea2c65393728d83a287a8b799.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9afe027dc18059af5e520581a86ddd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0478e182dcb47f15ac4f51b0c3a461e5.png)
A.80 | B.81 | C.82 | D.83 |
19-20高一下·河北唐山·阶段练习 查看更多[2]
更新时间:2020-09-19 14:42:32
|
相似题推荐
单选题
|
适中
(0.65)
名校
解题方法
【推荐1】等差数列
满足
,
,记
,其中
表示不超过x的最大整数,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b065334d8f60c49f4bd3d9f1373fe4cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb148bd8ad91c0ef275571029eee56d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3d08f31fde6cb6d7bc628709263770e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4f5908d6a1217e493ed7586b6964dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4ec6a21eac7d45d6f925d45aa2055e5.png)
A.1000 | B.2445 | C.1893 | D.500500 |
您最近一年使用:0次
单选题
|
适中
(0.65)
解题方法
【推荐1】已知
是首项为32的等比数列,
是其前
项和,且
,则数列
前10项和为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b4439516ce100f355fc203c2503110e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79a01631b941a560c5dbe143d5fdd45.png)
A.58 | B.56 | C.50 | D.45 |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐2】设数列
的通项公式为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf4ae73a6f9c290183bed81c5b622e72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/567a7faf486cb3fea99b8318e3da2736.png)
A.153 | B.210 | C.135 | D.120 |
您最近一年使用:0次