在
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的展开式中常数项为
(用数字作答).
考点分析:
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已知直线y=
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-x与圆x
2+y
2=2相交于A,B两点,是优弧AB上任意一点,则∠APB=( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516011_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516011_ST/2.png)
C.
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D.
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设f(x)为奇函数,且在(-∞,0)内是减函数,f(-2)=0,则xf(x)<0的解集为( )
A.(-1,0)∪(2,+∞)
B.(-∞,-2)∪(0,2)
C.(-∞,-2)∪(2,+∞)
D.(-2,0)∪(0,2
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在航天员进行的一项太空实验中,要先后实施6个程序,其中程序A只能出现在第一步或最后一步,程序B和C实施时必须相邻,请问实验顺序的编排方法共有( )
A.24种
B.48种
C.96种
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给出下列命题:
①
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•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/1.png)
=0,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/2.png)
=
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或
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/4.png)
=
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/5.png)
.②若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/6.png)
为单位向量且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/7.png)
∥
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/8.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/9.png)
=|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/10.png)
|•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/11.png)
.③
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/12.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/13.png)
•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/14.png)
=|
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/15.png)
|
3.④若
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与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/17.png)
共线,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/18.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/19.png)
共线,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231338008251607/SYS201311012313380082516008_ST/20.png)
与
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共线.
其中正确的个数是( )
A.0
B.1
C.2
D.3
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已知直线l、m,平面α、β,则下列命题中假命题是( )
A.若α∥β,l⊂α,则l∥β
B.若α∥β,l⊥α,则l⊥β
C.若l∥α,m⊂α,则l∥m
D.若α⊥β,α∩β=l,m⊂α,m⊥l,则m⊥β
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