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在三角形ABC中,∠ABC=60°,AB=2,BC=6,在BC上任取一点D,使△...
在三角形ABC中,∠ABC=60°,AB=2,BC=6,在BC上任取一点D,使△ABD为钝角三角形的概率为( )
A.
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B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024190840168101831/SYS201310241908401681018052_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024190840168101831/SYS201310241908401681018052_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024190840168101831/SYS201310241908401681018052_ST/3.png)
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且目标函数z=2x+y的最大值为7,最小值为1,则
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=( )
A.2
B.1
C.-1
D.-2
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过点A(a,a)可作圆x
2+y
2-2ax+a
2+2a-3=0的两条切线,则实数a的取值范围为( )
A.a<-3或
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B.
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C.a<-3
D.-3<a<1或
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在区间[0,1]上任意取两个实数a,b,则函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024190840168101831/SYS201310241908401681018048_ST/0.png)
在区间[-1,1]上有且仅有一个零点的概率为( )
A.
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B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024190840168101831/SYS201310241908401681018048_ST/3.png)
D.
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已知三角形ABC中,点D是BC的中点,过点D的直线分别交直线AB,AC于E、F两点,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024190840168101831/SYS201310241908401681018047_ST/0.png)
=
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(λ>0),
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=μ
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(μ>0),则
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的最小值是( )
A..9
B.
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C.5
D.
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