1 . 已知原命题是“若
,则曲线
是椭圆”.
(1)试写出原命题的逆命题、否命题、逆否命题,并判断所写命题的真假;
(2)若曲线
是焦点在
轴上的双曲线,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d364ffe09abd0f6022147d130c82dccb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e32500972421f941c78967a4948921.png)
(1)试写出原命题的逆命题、否命题、逆否命题,并判断所写命题的真假;
(2)若曲线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71e32500972421f941c78967a4948921.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
您最近一年使用:0次
2 . 已知原命题是:“若
,则
”.
(1)写出原命题的逆命题、逆否命题,并判断上述二个命题的真假;
(2)已知
,如果“
”是“
”的充分不必要条件,求实数
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e4848e12d90125411fb07a7e524de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fde64f4d3c38e43fbdee24eadc4b0dd.png)
(1)写出原命题的逆命题、逆否命题,并判断上述二个命题的真假;
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32e4848e12d90125411fb07a7e524de6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c386d932be86f7caed4d23ecd509ad75.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
您最近一年使用:0次