已知命题p:x
2-8x-20≤0,q:1-a≤x≤1+a(a>0),若非p是非q的充分不必要条件,求a的取值范围.
考点分析:
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已知椭圆
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102301227608257/SYS201311031023012276082014_ST/0.png)
的左、右焦点分别为F
1(-c,0),F
2(c,0),若椭圆上存在一点P使
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102301227608257/SYS201311031023012276082014_ST/1.png)
,则该椭圆的离心率的取值范围为
.
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命题“若a=0且b=0,则a
2+b
2=0”的否命题为
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在△ABC,设角A,B,C的对边分别为a,b,c,且
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=
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,则角B=
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若直线2ax-by+2=0(a>0,b>0)被圆x
2+y
2+2x-4y+1=0截得的弦长为4,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102301227608257/SYS201311031023012276082011_ST/0.png)
+
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的最小值为
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已知实数m是2,8的等比中项,则圆锥曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102301227608257/SYS201311031023012276082010_ST/0.png)
=1的离心率为
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