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已知两点M(-1,0),N(1,0)若直线3x-4y+m=0上存在点P满足,则实...
已知两点M(-1,0),N(1,0)若直线3x-4y+m=0上存在点P满足
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025123713132716314/SYS201310251237131327163010_ST/0.png)
,则实数m的取值范围是( )
A.(-∞,-5]∪[5,+∞)
B.(-∞,-25]∪[25,+∞)
C.[-25,25]
D.[-5,5]
考点分析:
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设l
1、l
2是两条不重合的直线,α、β是两个不重合的平面,给出下列四个命题:①若l
1⊂α,l
2⊂β,l
1∥β,l
2∥α,则α∥β②l
1⊥α,l
2⊥α,则l
1∥l
2③若l
1⊥α,l
1⊥l
2,则l
2∥α④若α⊥β,l
1⊂α,则l
1⊥β,其中正确的命题个数为( )
A.0
B.1
C.2
D.3
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过点P(1,2)作直线l,使直线l与点M(2,3)和点N(4,-5)距离相等,则直线l的方程为( )
A.y+2=-4(x+1)
B.3x+2y-7=0或4x+y-6=0
C.y-2=-4(x-1)
D.3x+2y-7=0或4x+y+6=0
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向量
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=(1,2),
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=(-2,3),若
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与
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共线,其中(m、n∈R,且n≠0),则
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=( )
A.
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B.2
C.
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D.-2
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如图所示的算法流程图中,若f(x)=2
x,g(x)=x
3,则h(2)的值为( )
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A.9
B.8
C.6
D.4
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在长为3m的线段AB上任取一点P,则点P与线段两端点A、B的距离都大于1m的概率是( )
A.
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B.
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C.
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D.
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