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过点(2,-4)且与直线x-y+1=0平行的直线的方程的一般式是 .
过点(2,-4)且与直线x-y+1=0平行的直线的方程的一般式是 .
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定义
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027352359/SYS201311012248570273523009_ST/0.png)
,已知x、y满足条件
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027352359/SYS201311012248570273523009_ST/1.png)
,若z=max(3x-y,4x-2y),则z的取值范围是( )
A.[-10,8]
B.[2,8]
C.[-10,6]
D.[-16,6]
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设a、b、c是△ABC的三个内角A、B、C所对的边(a≠c),且lgsinA、lgsinB、lgsinC成等差数列,那么直线(cosAcosC+cos
2B)x-ysinA+a=0与直线(1+cosB)x+ysinC-c=0的位置关系是( )
A.平行
B.垂直
C.相交但不垂直
D.重合
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圆x
2+y
2-2axcosθ-2bysinθ-a
2sin
2θ=0在x轴上截得的弦长为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027352359/SYS201311012248570273523007_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027352359/SYS201311012248570273523007_ST/1.png)
C.2|a|
D.4|a|
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若直线x+3y-7=0,kx-y-2=0和x轴、y轴围成的四边形有外接圆,则实数k 等于( )
A.1
B.2
C.3
D.4
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设P(x,y)是曲线C:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027352359/SYS201311012248570273523005_ST/0.png)
为参数,0≤θ<2π)上任意一点,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027352359/SYS201311012248570273523005_ST/1.png)
的取值范围是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027352359/SYS201311012248570273523005_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027352359/SYS201311012248570273523005_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224857027352359/SYS201311012248570273523005_ST/4.png)
D.
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