1 . 设命题
.命题
.命题
若
,则
是增函数.
(1)写出命题
的否命题;
(2)判断命题
的真假,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddb00f8d969332de808886bd2dc6c108.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9443c460e5714c1257d21c409d7b0a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c6a1f8487afe3404c29a527bd69eb4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c472109d36ba3e37771845ac86f714a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0ddafd64cdba2ef71f3a4342fb223fa.png)
(1)写出命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
(2)判断命题
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4600c8eb14581c3386c72ceb25274149.png)
您最近一年使用:0次
解题方法
2 . 已知命题p:“∀x>﹣1,a≤x+
恒成立”;,命题q:“函数f(x)=
x3+ax2+2ax+1在R上存在极大值和极小值”,若命题“p且q”是假命题,“p或q”是真命题,求实数a的取值范围.
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560413573120/1572560419717120/STEM/1511629f674e40ccaf73096aa7e9585b.png)
![](https://img.xkw.com/dksih/QBM/2016/3/28/1572560413573120/1572560419717120/STEM/b5dfdb775e0b4059932741dc2af440a4.png)
您最近一年使用:0次