14-15高二上·吉林长春·开学考试
1 . 已知中心在原点,对称轴为坐标轴,长半轴长与短半轴长的和为
,离心率为
的椭圆的标准方程为________ .
![](https://img.xkw.com/dksih/QBM/2014/11/24/1571901969645568/1571901974781952/STEM/59854156cc2e49cd9e823fa648a0af01.png?resizew=33)
![](https://img.xkw.com/dksih/QBM/2014/11/24/1571901969645568/1571901974781952/STEM/de422ba4635a4250a29dfac403bdf6fb.png?resizew=15)
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11-12高二上·福建·期末
2 . 已知命题
,则
的否定形式为
![](https://img.xkw.com/dksih/QBM/2010/11/29/1569919260049408/1569919264743424/STEM/686a30dd5dd34b3bb85054c4ac97554a.png)
![](https://img.xkw.com/dksih/QBM/2010/11/29/1569919260049408/1569919264743424/STEM/56e224732d3043fabef2553c08e5607f.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
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