若(
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展开式的第3项为56,则
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=
.
考点分析:
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已知点P为双曲线
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的右支上一点,F
1、F
2为双曲线的左、右焦点,若
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,且△PF
1F
2的面积为2ac(c为双曲线的半焦距),则双曲线的离心率为( )
A.
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+1
B.
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+1
C.
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+1
D.
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+1
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对于函数y=f(x),我们把使f(x)=0的实数叫做函数y=f(x)的零点,设x
是函数f(x)=x
2-|log
2x|的一个零点,则x
所在的一个区间是( )
A.
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B.
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C.
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D.(1,+∞)
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已知向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024183424673816982/SYS201310241834246738169007_ST/1.png)
满足|
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|=|
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|=2,
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•
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=0,若向量向量
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与
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-
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共线,则|
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+
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|的最小值为( )
A.
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B.1
C.
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D.
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函数f(x)是定义在R上的增函数,y=f
-1(x)是它的反函数,若f(3)=0,f(2):a,f
-1(2)=b,f
-1(0)=c,则a,b,c的大小关系为( )
A.c>a>b
B.b>c>a
C.b>a>c
D.a>b>c
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2010年广州亚运会期间,某国代表团计划在比赛全部结束后,顺便从7个他们最喜爱的中国城市里选择5个进行游览.如果M、N为必选城市,并且在游览过程中必须按先M后N的次序经过M、N两城市(游览M、N两城市的次序可以不相邻),则他们可选择的不同游览线路有( )
A.120种
B.240种
C.480种
D.600种
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