名校
1 . 给出下列四个命题:①命题“
”为真,则实数
的范围是
;②设
,则“
”是“
”的充要条件;③关于
的方程
,存在实数
,使得方程恰有5个不同的实根;④函数
的定义域为D,若满足:(1)
在D内是单调函数;(2)存在
,使得
在
上的值域为
,那么就称函数
为“梦想函数”.若函数
是“梦想函数”,则t的取值范围是
;其中真命题有_________ (填序号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8983faa5adf0008b8d69c64cf3518f44.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/389d79319d0694c3d75bbaf19d0a8581.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73254f32b6da29ecc32df2e9f87a4c97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6a46e678bf9d2df5ad4c782b3dc22f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fc548fd3964424e7745160d89488326.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1160588efe90b4c33978434210b58dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efdc508908c6e24de51b57a108468dcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22dc1d011c26d664403778fe3e244043.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db527571cfd256c515424c6f9d114284.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5631e28a875d9dae435bea729b2633e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a4cc25791fb5a022347db7d99def82f.png)
您最近一年使用:0次
名校
解题方法
2 . 给出下列四个命题:
①
是
成立的充要条件;
②函数
的最小值为2;
③命题“
”的否定是“
”;
④不等式
解集为R,则实数
的取值范围
.
其中,正确结论的序号是_________ ;
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8248b8f489fdfb79d8fe71b434993a21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ef93286e12b28e74f6258f1656aaebd.png)
②函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0be25aee85478ae02b22d61475f3ca.png)
③命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef66c050e6fb84d00051223610ae9f10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea0ad18b5a380f97c728c554f9806d1.png)
④不等式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51257cda2e141e7d0ced23c49c08be9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7458e2398877563fddb9077d300c57.png)
其中,正确结论的序号是
您最近一年使用:0次