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两个命题P:“对任意实数x都有ax2+ax+1>0恒成立”;Q:“关于x的方程x...
两个命题P:“对任意实数x都有ax2+ax+1>0恒成立”;Q:“关于x的方程x2-x+a=0有两个不等的实数根”,如果P∨Q为真命题,P∧Q为假命题,则实数a的取值范围是 .
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顶点在原点,对称轴为y轴,顶点到准线的距离为4的抛物线方程是
.
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已知椭圆
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+
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=1的左、右焦点分别为F
1、F
2,点P在椭圆上,若P、F
1、F
2是一个直角三角形的三个顶点,则点P到x轴的距离为( )
A.
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B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650530165/SYS201311012314266505301009_ST/3.png)
C.
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或
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D.
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已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650530165/SYS201311012314266505301008_ST/0.png)
,则m,n之间的大小关系是( )
A.m>n
B.m<n
C.m=n
D.m≤n
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△ABC中,A=
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,BC=3,则△ABC的周长为( )
A.4
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650530165/SYS201311012314266505301007_ST/1.png)
sin(B+
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)+3
B.4
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sin(B+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650530165/SYS201311012314266505301007_ST/4.png)
)+3
C.6sin(B+
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)+3
D.6sin(B+
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)+3
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已知椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650530165/SYS201311012314266505301006_ST/0.png)
+
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=1(a>b>0)的左焦点为F,右顶点为A,点B在椭圆上,且BF⊥x轴,直线AB交y轴于点P.若
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=2
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650530165/SYS201311012314266505301006_ST/3.png)
,则椭圆的离心率是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650530165/SYS201311012314266505301006_ST/4.png)
B.
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C.
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D.
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