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已知数列{an}的前n项和满足log2(Sn+1)=n+1,n∈N*,则an= ...
已知数列{an}的前n项和满足log2(Sn+1)=n+1,n∈N*,则an= .
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设f(x)=
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,则∫
2f(x)dx=
.
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在△ABC中,角A、B、C所对的边分别为a、b、c且2
b>2
a,log
sin2b<log
sin2c,b
2+c
2=a
2+
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bc,若
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101808360198572/SYS201311031018083601985011_ST/1.png)
,则cosB+sinC的取值范围是( )
A.(
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,
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)
B.(-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101808360198572/SYS201311031018083601985011_ST/4.png)
,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101808360198572/SYS201311031018083601985011_ST/5.png)
)
C.,(
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,
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101808360198572/SYS201311031018083601985011_ST/7.png)
)
D.(-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101808360198572/SYS201311031018083601985011_ST/8.png)
,
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)
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复数z
1=sinx+i,z
2=1+i•cosx(x∈R)在坐标平面中对应的点分别是A,B,若函数f(x)=
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(O为坐标原点),则下列命题正确的是( )
A.f(x)最大值为2
B.f(x)的图象向左平移
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个单位后对应的函数是奇函数
C.y=|f(x)|的周期为2π
D.f(x)的图象向左平移
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101808360198572/SYS201311031018083601985010_ST/2.png)
后对应函数图象关于x=0对称
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若△ABC的面积为
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,AB=3,AC=5,且角A为钝角,边BC的中点为D,则AD长度为( )
A.
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B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101808360198572/SYS201311031018083601985009_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101808360198572/SYS201311031018083601985009_ST/3.png)
D.7
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函数f(x)=x
2-2ax+a在区间(-∞,1)上有最小值,则函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101808360198572/SYS201311031018083601985008_ST/0.png)
在区间(1,+∞)上一定( )
A.有最小值
B.有最大值
C.是减函数
D.是增函数
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