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如图,在平面斜坐标中∠xoy=45°,斜坐标定义为(其中分别为斜坐标系的x轴,y...
如图,在平面斜坐标中∠xoy=45°,斜坐标定义为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183006_ST/0.png)
(其中
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183006_ST/1.png)
分别为斜坐标系的x轴,y轴的单位向量),则点P的坐标为(x
,y
).若F
1(-1,0),F
2(1,0),且动点M(x,y)满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183006_ST/2.png)
,则点M在斜坐标系中的轨迹方程( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183006_ST/images3.png)
A.x=0
B.y=0
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183006_ST/3.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183006_ST/4.png)
考点分析:
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已知P为双曲线C:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183005_ST/0.png)
上的点,点M满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183005_ST/1.png)
,且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183005_ST/2.png)
,则当
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183005_ST/3.png)
取得最小值时的点P到双曲线C的渐近线的距离为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183005_ST/4.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183005_ST/5.png)
C.4
D.5
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已知每项均大于零的数列{a
n}中,首项a
1=1且前n项的和S
n满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183004_ST/0.png)
(n∈N
*,且n≥2),则a
81=( )
A.638
B.639
C.640
D.641
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当
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183003_ST/0.png)
时,函数f(x)=Asin(x+φ)(A>0)取得最小值,则函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183003_ST/1.png)
是( )
A.奇函数且图象关于点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183003_ST/2.png)
对称
B.偶函数且图象关于点(π,0)对称
C.奇函数且图象关于直线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183003_ST/3.png)
对称
D.偶函数且图象关于点
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183003_ST/4.png)
对称
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一次函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183002_ST/0.png)
的图象同时经过第一、三、四象限的必要但不充分条件是( )
A.m>1,且n<1
B.mn<0
C.m>0,且n<0
D.m<0,且n<0
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已知集合
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101248535218302/SYS201311031012485352183001_ST/0.png)
,则(∁
RB)∩A等于( )
A.R
B.(1,2]
C.[0,1]
D.ϕ
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