满分5 >
高中数学试题 >
若三点P(1,1),A(2,-4),B(x,-9)共线,则x= .
若三点P(1,1),A(2,-4),B(x,-9)共线,则x= .
考点分析:
相关试题推荐
已知α,β为锐角,且cosα=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451010_ST/0.png)
,cosβ=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451010_ST/1.png)
,则α+β的值是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451010_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451010_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451010_ST/4.png)
D.
查看答案
下列各式中,值为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451009_ST/0.png)
的是( )
A.sin15°cos15°
B.cos
2![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451009_ST/1.png)
-sin
2![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451009_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451009_ST/3.png)
D.
查看答案
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451008_ST/images0.png)
函数y=Asin(ωx+φ)( A>0,ω>0,|φ|<
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451008_ST/0.png)
)的部分图象如图所示,则该函数的表达式为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451008_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451008_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451008_ST/3.png)
D.
查看答案
在平行四边形ABCD中,AC与DB交于点O,E是线段OD的中点,AE延长线与CD交于F.若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451007_ST/0.png)
=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451007_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451007_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101221857137345109/SYS201311012218571373451007_ST/3.png)
D.
查看答案