解题方法
1 . 已知
关于
的方程
在
上恰有3个解,
存在
,使不等式
成立.
(1)若
为真命题,求正数
的取值范围;
(2)若
为真命题,且
为假命题,求正数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51441c8788ff11be766766227793246d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef388c6b02635906c3bfd3d10ae3d815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/365114c53aa12abda1004c8e4cb4ca0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce20ef9c08e82df8c7f45bac6dd31d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/517daac9aa260866798457d3018c64bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba9e60bc534f4525e658dde7a9493c28.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f675824e539f50cec53120959d32e554.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78008129f31f574893d5b0461a4da18f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2020-02-09更新
|
532次组卷
|
4卷引用:河南省新乡市2019-2020学年高二上学期期末数学(文科)试题
河南省新乡市2019-2020学年高二上学期期末数学(文科)试题河南省新乡市2019-2020学年高二上学期期末数学(理科)试题(已下线)1.4.1_1.4.2+全称量词与存在量词(重点练)-2020-2021学年高二数学(理)十分钟同步课堂专练(人教A版选修2-1)(已下线)1.4.1_1.4.2+全称量词与存在量词(重点练)-2020-2021学年高二数学(文)十分钟同步课堂专练(人教A版选修1-1)
21-22高一·湖南·课后作业
2 . 写出下列命题的否定,并判断其真假.
(1)
:5不是75的约数;
(2)
:
是不等式
的解;
(3)
:方程
有实数根;
(4)
:空集是集合
的子集.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c0aa2ef928b6e3341d0a0dc6d8055b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff3759ae3c1d36895956ad842e834386.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef85dce988111cd062503db4e4b4189.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1010846eeec6c9da29640f5aa3f8738.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
您最近一年使用:0次
3 . 已知命题
是方程
的两个实根 ,且不等式
对任意的
恒成立;命题
不等式
有实数解. 若命题
为真,
为假,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8ac9e0e0eeae279921422efd45e24b2.png)
![](https://img.xkw.com/dksih/QBM/2016/11/24/1573179415838720/1573179421548544/STEM/dd3c2a76f0d947f480a89ab3deb0ab52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b590ead5195f582b854652e9dc5af8fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d1dbacb32c6aa64b346cfc40c5e7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce20ef9c08e82df8c7f45bac6dd31d36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/451e12eab40cf38b8ffdf48e93e8a901.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0045a603e555d2d2a8ef634f9edf9951.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a31351c3868449fd115650c13152be8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次
2016-12-04更新
|
403次组卷
|
3卷引用:2016-2017学年河南郑州一中高二上期中考试理数试卷