9-10高二下·江西新余·阶段练习
1 . 对于曲线C:
给出下面四个命题:
①曲线C不可能表示椭圆;
②当
时,曲线C表示椭圆;
③若曲线C表示双曲线,则
或![](https://img.xkw.com/dksih/QBM/2010/7/8/1569784929886208/1569784934670336/STEM/251cbabe54e140d281b0d9c84dc06e9b.png?resizew=39)
④若曲线C表示焦点在
轴上的椭圆,则![](https://img.xkw.com/dksih/QBM/2010/7/8/1569784929886208/1569784934670336/STEM/32e3e517d7c64bf7860c5178ca7cdb45.png?resizew=63)
其中所有正确命题的序号为______________
![](https://img.xkw.com/dksih/QBM/2010/7/8/1569784929886208/1569784934670336/STEM/d12fe525f35c45a79b51360540a5d4c7.png?resizew=108)
①曲线C不可能表示椭圆;
②当
![](https://img.xkw.com/dksih/QBM/2010/7/8/1569784929886208/1569784934670336/STEM/f2013ce21044405ea43183b322041cb0.png?resizew=60)
③若曲线C表示双曲线,则
![](https://img.xkw.com/dksih/QBM/2010/7/8/1569784929886208/1569784934670336/STEM/8dd5f2c41ae94164b458b4b878524670.png?resizew=35)
![](https://img.xkw.com/dksih/QBM/2010/7/8/1569784929886208/1569784934670336/STEM/251cbabe54e140d281b0d9c84dc06e9b.png?resizew=39)
④若曲线C表示焦点在
![](https://img.xkw.com/dksih/QBM/2010/7/8/1569784929886208/1569784934670336/STEM/a821bd9c2ceb452c9860fbecc46a081e.png?resizew=13)
![](https://img.xkw.com/dksih/QBM/2010/7/8/1569784929886208/1569784934670336/STEM/32e3e517d7c64bf7860c5178ca7cdb45.png?resizew=63)
其中所有正确命题的序号为
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