1 . 下列说法正确的个数有个.
(1)命题:“指数函数
在
上是增函数”的非命题为真时,则
;
(2)命题:“若
,则
中至少有一个不小于
”的逆命题是真命题;
(3)命题:“若
,则
”的逆否命题是“若
,则
”;
(4)已知
,则“
”是“曲线
为双曲线”的充要条件.
(1)命题:“指数函数
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572610129403904/1572610135351296/STEM/86edbfe4a3224daab8cb349b3b85f319.png)
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572610129403904/1572610135351296/STEM/1ce85b5c19a74eee91a45fb0aaaab89b.png)
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572610129403904/1572610135351296/STEM/66d5cf3e638e477dac83326fcf8e971b.png)
(2)命题:“若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85556197734983d956148681610e8c57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
(3)命题:“若
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572610129403904/1572610135351296/STEM/dcb20798236948e985e0f895a3d111b6.png)
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572610129403904/1572610135351296/STEM/b740e31f8a1a47b0a4d187f5761a62e3.png)
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572610129403904/1572610135351296/STEM/abb56d2e39ea4dd6bd2744cde2afe314.png)
![](https://img.xkw.com/dksih/QBM/2016/4/29/1572610129403904/1572610135351296/STEM/56aadde89b604e649a922354a581200f.png)
(4)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de18c5ae806d998e6b7a035d2c2e1da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6290ccdc3c69fd616b6388d9096f8f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2085af2326d0e13a12d3db8dbb79f51.png)
A.1 | B.2 | C.3 | D.4 |
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A.1 | B.2 | C.3 | D.4 |