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设Sn是等差数列{an}的前n项和,若S5=a8+5,S6=a7+a9-5,则公...
设Sn是等差数列{an}的前n项和,若S5=a8+5,S6=a7+a9-5,则公差d等于 .
考点分析:
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已知双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334009_ST/0.png)
的离心率为2,焦点与椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334009_ST/1.png)
的焦点相同,那么双曲线渐近线方程为
.
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点P在直线l:y=x-1上,若存在过P的直线交抛物线y=x
2于A,B两点,且|PA|=|AB|,则称点P为“
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334008_ST/images0.png)
点”,那么下列结论中正确的是( )
A.直线l上的所有点都是“
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334008_ST/images1.png)
点”
B.直线l上仅有有限个点是“
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334008_ST/images2.png)
点”
C.直线l上的所有点都不是“
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334008_ST/images3.png)
点”
D.直线l上有无穷多个点(点不是所有的点)是“
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334008_ST/images4.png)
点”
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334007_ST/images0.png)
某几何体的三视图如图所示,该几何体的体积是( )
A.8
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334007_ST/0.png)
C.4
D.
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直线ax+by+a+b=0与圆x
2+y
2=2的位置关系为( )
A.相交
B.相切
C.相离
D.相交或相切
查看答案
在△ABC中,M是BC的中点,AM=1,点P在AM上且满足学
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334005_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334005_ST/1.png)
等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334005_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334005_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102747346433415/SYS201311031027473464334005_ST/4.png)
D.
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