本题共有2个小题,每1小题满分6分.已知集合A={x|3x
2+x-2≥0,x∈R},
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677018_ST/0.png)
.
(1)用区间表示集合A、B;
(2)求A∩B.
考点分析:
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(文)变量x、y满足下列条件:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677017_ST/0.png)
则使z=3x+2y的值最小的(x,y)是( )
A.(9,2)
B.(6,4)
C.(4.5,3)
D.(3,6)
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(理)在正方体ABCD-A
1B
1C
1D
1中,点E在A
1C
1上,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677016_ST/0.png)
且
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677016_ST/1.png)
,则( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677016_ST/images2.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677016_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677016_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677016_ST/4.png)
D.
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/0.png)
,且向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/1.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/2.png)
平行,则下列说法正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/3.png)
,向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/4.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/5.png)
方向相反
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/6.png)
,向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/7.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/8.png)
方向相同
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/9.png)
,向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/10.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/11.png)
方向相反
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/12.png)
,向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/13.png)
与
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182848321667756/SYS201310241828483216677015_ST/14.png)
方向相同
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