1 . 已知
,
;
:函数
有两个零点.
(1)写出命题
;
(2)若
为真命题,
为假命题,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54f8e2b85e8c13a5391e60bd6a0ecc65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5016e322392475b7ed9bf8baa1fe6f13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9aa8a716a31b0f51b70fdf9bdb257909.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fee223e1abbaa082dc8ea8af2527d4f3.png)
(1)写出命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c13472bf0353e16784a22e1f890fba40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
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2 . 判断下列命题的真假,并写出这些命题的否定.
(1)平面直角坐标系下每条直线都与
轴相交;
(2)
;
(3)存在一个无理数,它的立方根是有理数.
(1)平面直角坐标系下每条直线都与
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f3d0e7bcb599dfec93dee8fb62981a3.png)
(3)存在一个无理数,它的立方根是有理数.
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