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设O为坐标原点,点A(1,1),若点,则取得最小值时,点B的个数是( ) A.1...
设O为坐标原点,点A(1,1),若点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182905489260051/SYS201310241829054892600004_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182905489260051/SYS201310241829054892600004_ST/1.png)
取得最小值时,点B的个数是( )
A.1
B.2
C.3
D.无数个
考点分析:
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已知函数f(x)=(x-a)(x-b)(其中a>b)的图象如图所示,则函数g(x)=a
x+b
x的图象是( )
A.
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B.
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C.
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D.
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函数
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的图象( )
A.关于原点成中心对称
B.关于y轴成轴对称
C.关于
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成中心对称
D.关于直线
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成轴对称
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已知命题P:∀x∈R,x>sinx,则P的否定形式为( )
A.P:∃x∈R,x≤sin
B.P:∀x∈R,x≤sin
C.P:∃x∈R,x<sin
D.P:∀x∈R,x<sin
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若纯虚数z满足(2-i)z=4-bi,(i是虚数单位,b是实数),则b=( )
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已知椭圆C:
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=1(a>b>0)的离心率e=
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,且椭圆经过点N(2,-3).
(1)求椭圆C的方程.
(2)求椭圆以M(-1,2)为中点的弦所在直线的方程.
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