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函数,x∈[0,π]的图象绕x轴旋转一周,得到一旋转体,该旋转体的体积为( ) ...
函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101422211268191/SYS201311031014222112681009_ST/0.png)
,x∈[0,π]的图象绕x轴旋转一周,得到一旋转体,该旋转体的体积为( )
A.1
B.2
C.π
D.2π
考点分析:
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对于函数
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(其中a、b∈R,c∈Z),选取a、b、c的一组值计算f(1)、f(-1),所得结果一定不是( )
A.4和6
B.3和1
C.2和4
D.1和2
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已知A.B.C是平面上不共线的三点,O为△ABC的外心,动点P满足
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=
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(λ∈R),则P的轨迹一定过△ABC的( )
A.内心
B.垂心
C.重心
D.AC边的中点
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等差数列{a
n},{b
n}的前n项和分别为S
n,T
n,若
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=
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,则
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=( )
A.
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B.
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C.
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D.
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已知a是函数
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的零点,若0<x
<a,则f(x
)的值满足( )
A.f(x
)=0
B.f(x
)>0
C.f(x
)<0
D.f(x
)的符号不确定
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函数y=f(x)的图象在P处切线l,(如图)则f(2)+f′(2)的值( )
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A.
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B.
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C.
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D.
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