1 . 已知方程
只有1个解,则实数
的取值范围是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f07af0e00098115f3e90f90c98c0c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
您最近一年使用:0次
解题方法
2 . 已知
.
(1)证明:
.
(2)若
恒成立,求n的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fc40ef019eaa9eb6b29afa510eb0ba5.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb263c065e73b91fdd0b9e6673fc4a3e.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abab18ecb99313d1ac541db4e708eb5d.png)
您最近一年使用:0次
3 . 如图所示,将若干个点摆成三角形图案,每条边(包括两个端点)有n(n>1,n∈N*)个点,相应的图案中总的点数记为an,则
等于( )
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096589723123712/2097507345170433/STEM/3d8b3fb3dff94df98fa33edc8793574c.png?resizew=554)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6281d49b6274623bd842849fcaddcc4d.png)
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096589723123712/2097507345170433/STEM/3d8b3fb3dff94df98fa33edc8793574c.png?resizew=554)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
4 . 设
是正整数,则定积分
的值( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eea609493dd696dc2a3122a8035d9ac4.png)
A.等于0 | B.等于1 |
C.等于![]() | D.与![]() |
您最近一年使用:0次
5 . 令
表示正整数n的所有数字的乘积,如
,
,
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f7f054f55c3c5a75d9a2c82a513677.png)
_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/450aef8109c4f6c2c79c98dca2903aa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fb7fe6d2c610b3d5e35f80056617929.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74212326984ef23f75584820eb121d11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f7f054f55c3c5a75d9a2c82a513677.png)
您最近一年使用:0次
6 . 设a,b,c为非负实数,满足
,则
的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a57e060f61f7efa54982bda67db483a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec734b5cdada9571e5221e198d0dc78d.png)
A.3 | B.4 | C.![]() | D.前三个答案都不对 |
您最近一年使用:0次
7 . 满足
的互不相似的
的个数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae512cb71b62247b6edb92ee701a4d61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.0 | B.1个 | C.2个 | D.前三个答案都不对 |
您最近一年使用:0次
8 . 已知函数
,若
与
的图象有2个交点,则实数a的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bddcc25092987c8a648d2d7ebf2d8993.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14a2a1822ac7392b61b2c0fffc1fbc05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
A.![]() | B.![]() |
C.![]() | D.前三个答案都不对 |
您最近一年使用:0次