椭圆短轴的一个端点与两个焦点组成一个正三角形,焦点到椭圆长轴端点的最短距离为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225134671483666/SYS201311012251346714836018_ST/0.png)
,求此椭圆的标准方程.
考点分析:
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求下列函数的导函数
(1)y=x
2sinx; (2)y=
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求适合下列条件的椭圆的标准方程:
(1)两个焦点的坐标分别是(-4,0),(4,0),椭圆上一点P到两焦点距离之和等于10;
(2)两个焦点的坐标分别是(0,-2)、(0,2),并且椭圆经过点(-
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有下列命题:①双曲线
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-
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=1与椭圆
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+y
2=1有相同的焦点;②(lnx)
′=
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;③(tanx)
′=
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;④(
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)
′=
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;⑤∀x∈R,x
2-3x+3≠0.其中是真命题的有:
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曲线y=xe
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椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101225134671483666/SYS201311012251346714836013_ST/0.png)
+
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=1上一点P到它的一个焦点的距离等于3,那么点P到另一个焦点的距离等于
.
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