满分5 >
高中数学试题 >
AB是过抛物线y2=4x焦点F的弦,已知A,B两点的横坐标分别是x1,x2且x1...
AB是过抛物线y2=4x焦点F的弦,已知A,B两点的横坐标分别是x1,x2且x1+x2=6,则|AB|等于( )
A.10
B.8
C.7
D.6
考点分析:
相关试题推荐
双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998004_ST/0.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998004_ST/1.png)
=1的渐近线方程是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998004_ST/2.png)
±
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998004_ST/3.png)
=0
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998004_ST/4.png)
±
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998004_ST/5.png)
=0
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998004_ST/6.png)
±
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998004_ST/7.png)
=0
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998004_ST/8.png)
±
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998004_ST/9.png)
=0
查看答案
中心在原点,焦点在y轴,离心率为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998003_ST/0.png)
的椭圆方程可能为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998003_ST/1.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998003_ST/2.png)
=1
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998003_ST/3.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998003_ST/4.png)
=1
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998003_ST/5.png)
+y
2=1
D.x
2+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998003_ST/6.png)
=1
查看答案
双曲线方程为x
2-2y
2=1,则它的右焦点坐标为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998002_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998002_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998002_ST/2.png)
D.
查看答案
抛物线y
2=-8x的焦点坐标是( )
A.(2,0)
B.(-2,0)
C.(4,0)
D.(-4,0)
查看答案
直线3x+2y+6=0的斜率为k,在y轴上的截距为b,则有( )
A.k=-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998000_ST/0.png)
,b=3
B.k=-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998000_ST/1.png)
,b=-2
C.k=-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998000_ST/2.png)
,b=3
D.k=-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224318610199899/SYS201311012243186101998000_ST/3.png)
,b=-3
查看答案