已知ABCD-A
1B
1C
1D
1是底面为菱形的直四棱柱,P是棱DD
1的中点,∠BAD=60°,底面边长为2,若PB与平面ADD
1A
1成45°角,求点A
1到平面ACP的距离.
考点分析:
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已知ABCD-A
1B
1C
1D
1是底面为菱形的直四棱柱,P是棱DD
1的中点,∠BAD=60°,底面边长为2,四棱柱的体积为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713027_ST/0.png)
,求异面直线AD
1与PB所成的角大小.(结果用反三角函数值表示)
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设函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713026_ST/0.png)
,区间M=[a,b](a<b),集合N={y|y=f(x),x∈M},则使M=N成立的实数对(a,b)有( )
A.1个
B.2个
C.3个
D.无数多个
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已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713025_ST/0.png)
,(a>0),x∈(0,b),则下列判断正确的是( )
A.当
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713025_ST/1.png)
时,f(x)的最小值为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713025_ST/2.png)
B.当
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713025_ST/3.png)
时,f(x)的最小值为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713025_ST/4.png)
C.当
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713025_ST/5.png)
时,f(x)的最小值为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713025_ST/6.png)
D.对任意的b>0,f(x)的最小值均为
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[理科]观察下列式子:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713024_ST/0.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713024_ST/1.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713024_ST/2.png)
,…,可以猜想结论为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713024_ST/3.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713024_ST/4.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713024_ST/5.png)
D.
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若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713023_ST/0.png)
(n是正整数),则a
n+1=a
n+( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713023_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713023_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182933773871313/SYS201310241829337738713023_ST/3.png)
D.
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