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如果对于任意实数x,[x]表示不超过x的最大整数.例如[3.27]=3,[0.6...
如果对于任意实数x,[x]表示不超过x的最大整数.例如[3.27]=3,[0.6]=0.那么“[x]=[y]”是“|x-y|<1”的( )
A.充分而不必要条件
B.必要而不充分条件
C.充分必要条件
D.既不充分也不必要条件
考点分析:
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某几何体的三视图如图,它的表面积为( )
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A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760003_ST/0.png)
B.
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C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760003_ST/2.png)
D.
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设{a
n}是公比为q的等比数列,|q|>1,令b
n=a
n+1(n=1,2,…),若数列{b
n}有连续四项在集合{-53,-23,19,37,82}中,则q等于( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760002_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760002_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760002_ST/2.png)
D.
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若向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760001_ST/0.png)
=(1,1),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760001_ST/1.png)
=(-1,1),
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760001_ST/2.png)
=(4,2),则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760001_ST/3.png)
=( )
A.3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760001_ST/4.png)
+
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760001_ST/5.png)
B.3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760001_ST/6.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760001_ST/7.png)
C.-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760001_ST/8.png)
+3
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760001_ST/9.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760001_ST/10.png)
+3
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若复数
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为纯虚数,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572376098/SYS201311031022385723760000_ST/1.png)
的值为( )
A.1
B.-1
C.i
D.-i
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已知函数f(x)=x
2-(2a-1)x+a
2-2,g(x)=-3
x-2,
(1)若f(x)在区间(3,+∞)上单调递增,求a的取值范围;
(2)若f(x)与非负x轴至少有一个交点,求a的取值范围;
(3)当
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时,判断f(x)与g(x)的交点个数并说明理由.
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