方程log2|x|=x2-2的实根的个数为 .
考点分析:
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已知F
1、F
2分别是双曲线
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103095909743293072/SYS201311030959097432930011_ST/0.png)
-
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=1的左、右焦点,过F
1且垂直于x轴的直线与双曲线交于A、B两点,若△ABF
2为钝角三角形,则该双曲线的离心率e的取值范围是( )
A.(1,+∞)
B.(1,
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)
C.(1,1+
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)
D.(1+
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,+∞)
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三人互相传球,由甲开始发球,并作为第一次传球,经过5次传球后,球仍回到甲手中,则不同的传球方式共有( )
A.种
B.10种
C.8种
D.16种
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如图,点P是球O的直径AB上的动点,PA=x,过点P且与AB垂直的截面面积记为y,则y=f(x)的图象是( )
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A.
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B.
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C.
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D.
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设向量
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,则下列为
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与
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共线的充要条件的有( )
①存在一个实数λ,使得
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或
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; ②
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;
③
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; ④
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.
A.1个
B.2个
C.3个
D.4个
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已知两点A(-1,0),B(0,2),点P是椭圆
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=1上的动点,则△PAB面积的最大值为( )
A.4+
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B.4+
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C.2+
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D.2+
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