1 . 观察等式:
,
,
,
.若第n个等式为
,则满足不等式
恒成立的最大正整数
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3a15f23efc7db722ad87ee360ef473f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b7665d2244278da84dc45faa6aee42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3607f7acce2d96f68b873a6dbfc764b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e9a899d7712fa083a7394274e922b48.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a578beee81589d07171b832612fcf90f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b151edf935e6bb32ad523e826a9451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df64046e91b047037f19e4032e3b6de3.png)
A.5 | B.6 | C.7 | D.8 |
您最近一年使用:0次
名校
2 . 设
:二次函数
的图象恒在x轴的上方,
:关于
的方程
的两根都大于-1,则
是
的( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/622ced3b0212a33aa8edbd272f1ac1c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a16e230ebb1ee830579ce2ea82f64492.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
A.充分不必要条件 | B.必要不充分条件 |
C.充要条件 | D.既不充分也不必要条件 |
您最近一年使用:0次
3 . 已知
成等比数列,且曲线
的顶点是
,则
等于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c27a9af7db04a611063978a7990745e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ed26d145240e4464d7896be5b4ed4e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14dfdef13e84f373bf4e90db872ff97f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/557d947b148e6014712604ae558be16e.png)
A.5 | B.6 | C.7 | D.12 |
您最近一年使用:0次
2017-11-28更新
|
417次组卷
|
2卷引用:河南省某重点高中2017-2018学年上学期高二期中考试数学(理)试卷
4 . 已知
成等差数列,则二次函数
的图象与x轴交点个数是_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0581171926cada8c6036338be496b085.png)
您最近一年使用:0次
2016-12-04更新
|
266次组卷
|
3卷引用:2015-2016学年河南省林州一中高二上期中理科数学试卷
2015-2016学年河南省林州一中高二上期中理科数学试卷2015-2016学年河南省林州一中高二上期中文科数学试卷(已下线) 5.2.1 等差数列(学案)-2020-2021学年高中数学同步备课学案(2019人教B版选择性必修第三册)