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中心在原点,一个焦点是(-5,0),一条渐近线是直线4x-3y=0的双曲线方程是...
中心在原点,一个焦点是(-5,0),一条渐近线是直线4x-3y=0的双曲线方程是 .
考点分析:
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设等差数列{a
n}、{b
n}的前n项和分别为S
n、T
n,若对任意自然数n都有
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=
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,则
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+
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的值为
.
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已知椭圆
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上的点P到一个焦点的距离为3,则P到另一个焦点的距离为
.
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数列{a
n}的前n项和s
n=2a
n-3(n∈N
*),则a
5=
.
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设F
1和F
2为双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102354187096684/SYS201311031023541870966007_ST/0.png)
-
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=1(a>0,b>0)的两个焦点,若F
1,F
2,P(0,2b)是正三角形的三个顶点,则双曲线的离心率为( )
A.
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B.2
C.
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D.3
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下列有关命题的说法正确的是( )
A.命题“若x
2=1,则x=1”的否命题为:“若x
2=1,则x≠1”
B.“x=-1”是“x
2-5x-6=0”的必要不充分条件
C.命题“∃x∈R,使得x
2+x+1<0”的否定是:“∀x∈R,均有x
2+x+1<0”
D.命题“若x=y,则sinx=siny”的逆否命题为真命题
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