已知方程
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231537910088572/SYS201311012315379100885013_ST/0.png)
,m为何值时
方程表示焦点在y轴的椭圆.
考点分析:
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在椭圆
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