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已知直线y=k(x+2)(k>0)与抛物线C:y2=8x相交于A、B两点,F为C...
已知直线y=k(x+2)(k>0)与抛物线C:y
2=8x相交于A、B两点,F为C的焦点,若|FA|=2|FB|,则k=( )
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231018237457553/SYS201311012310182374575011_ST/images1.png)
A.
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B.
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C.
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D.
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考点分析:
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时,函数
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的最小值为( )
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过点A(a,a)可作圆x
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A.a<-3或
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在同一个坐标系中画出函数y=a
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D.
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![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231018237457553/SYS201311012310182374575007_ST/0.png)
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)
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