在(1-x)5(3+x)的展开式中,x3的系数是 .
考点分析:
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已知集合A={(x,y)|x+y=2},B={(x,y)|x-2y=-4},则A∩B=
.
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已知抛物线y
2=2px(p>0)的焦点为F,点P
1(x
1,y
1),P
2(x
2,y
2),P
3(x
3,y
3)在抛物线上,且2x
2=x
1+x
3,则有( )
A.|FP
1|+|FP
2|=|FP
3|
B.|FP
1|
2+|FP
2|
2=|FP
3|
2C.2|FP
2|=|FP
1|+|FP
3|
D.|FP
2|
2=|FP
1|•|FP
3|
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设函数f(x)是奇函数,并且在R上为增函数,若0≤θ≤
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100529080121635/SYS201311031005290801216004_ST/0.png)
时,f(msinθ)+f(1-m)>0恒成立,则实数m的取值范围是( )
A.(0,1)
B.(-∞,0)
C.(-∞,1)
D.(-∞,
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)
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100529080121635/SYS201311031005290801216003_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100529080121635/SYS201311031005290801216003_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100529080121635/SYS201311031005290801216003_ST/2.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100529080121635/SYS201311031005290801216003_ST/3.png)
的夹角为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100529080121635/SYS201311031005290801216003_ST/4.png)
,如果
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100529080121635/SYS201311031005290801216003_ST/5.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100529080121635/SYS201311031005290801216003_ST/6.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100529080121635/SYS201311031005290801216003_ST/7.png)
=等于( )
A.2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100529080121635/SYS201311031005290801216003_ST/8.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100529080121635/SYS201311031005290801216003_ST/9.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103100529080121635/SYS201311031005290801216003_ST/10.png)
D.
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在正方体ABCD-A
1B
1C
1D
1中,E为AA
1的中点,点P在其对角面BB
1D
1D内运动,若EP总与直线AC成等角,则点P的轨迹有可能是( )
A.圆或圆的一部分
B.抛物线或其一部分
C.双曲线或其一部分
D.椭圆或其一部分
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