1 . 给出下列命题:
(1)设
是两个单位向量,它们的夹角是
,则![](https://img.xkw.com/dksih/QBM/2015/3/27/1572039484604416/1572039490215936/STEM/6499ff305c7d4bb6b5f368b6819dac56.png)
;
(2)已知函数
,若函数
有3个零点,则0<
<1;
(3)已知函数
的定义域和值域都是
,则
=1;
(4)定义在R上的函数
满足
,则
.
其中,正确命题的序号为 .
(1)设
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572039484604416/1572039490215936/STEM/2f30d3fcba0945ae969ad1eb9edc894e.png)
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572039484604416/1572039490215936/STEM/48b6c0518220426b885d9f82ad7f6b96.png)
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572039484604416/1572039490215936/STEM/6499ff305c7d4bb6b5f368b6819dac56.png)
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572039484604416/1572039490215936/STEM/36eaaeb747cf499da565999380af99c2.png)
(2)已知函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd574f26c275b8aad0d6d39a0d3fc37a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a96c1cfecb7d2f8d4d949daf982f5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(3)已知函数
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572039484604416/1572039490215936/STEM/0d8d2ca927db4724af2fc18e690397fc.png)
![](https://img.xkw.com/dksih/QBM/2015/3/27/1572039484604416/1572039490215936/STEM/93b980ab046f44a6ac05921c1d1927b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d6fc9b90f370fbb27552876b650f8f.png)
(4)定义在R上的函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fe7d5809da02c15a43a0e9a898b9086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc4c8fd1eea02850e3b0a0b45715a1ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d20a25ebf7c9c31ebb3ee2a372852fc9.png)
其中,正确命题的序号为 .
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解题方法
2 . 下列四种说法:
①命题“
,使得
”的否定是“
,都有
”;
②设
、
是简单命题,若“
”为假命题,则“
” 为真命题;
③若
是
的充分不必要条件,则
是
的必要不充分条件;
④把函数
的图象上所有的点向右平移
个单位即可得到函数
的图象.
其中所有正确说法的序号是_________________________ .
①命题“
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8644dcf399ddfb178c88fd2f45965c88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a74b4a1af4670dbcc18b9d6af6bd9fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58264e5012ee475894984e6032968d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/774922c30b41d752ce495adc20f2dd05.png)
②设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d4eed113aa69a7d973c6410bae7ddf.png)
③若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30fd5acd3cea0866f64bc80ab4c14e3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af9aacc4fa7d44974d18a3fb9e290b5c.png)
④把函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09301df9fd58ccc7343a9a6383a1ea67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c487fec20bd809e0baf5cb39afe8979.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66492e9d06b2983fb17503bfb048bc9.png)
其中所有正确说法的序号是
您最近一年使用:0次