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若AB是过椭圆中心的一条弦,M是椭圆上任意一点,且AM,BM与坐标轴不平行,kA...
若AB是过椭圆
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中心的一条弦,M是椭圆上任意一点,且AM,BM与坐标轴不平行,k
AM,k
BM分别表示直线AM,BM的斜率,则k
AM•k
BM=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224508578894524/SYS201311012245085788945008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224508578894524/SYS201311012245085788945008_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224508578894524/SYS201311012245085788945008_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224508578894524/SYS201311012245085788945008_ST/4.png)
考点分析:
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F
1,F
2为椭圆
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的两个焦点,过F
2作椭圆的弦AB,若△AF
1B的周长为16,椭圆的离心率
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,则椭圆的方程是( )
A.
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B.
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D.
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随机变量ξ的分布列为P(ξ=k)=
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,k=1,2,3,4,其中c为常数则P(ξ≥2)等于( )
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”m>n>0”是”方程mx
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2=1表示焦点在y轴上的椭圆”的( )
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B.必要而不充分条件
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D.既不充分也不必要条件
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五项不同的工程,由三个工程队全部承包下来,每队至少承包一项工程.则不同的承包方案有( )
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设(5x-
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n的展开式的各项系数之和为M,二项式系数之和为N,若M-N=56,则展开式中常数项为( )
A.5
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C.10
D.20
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