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已知函数f(x)的导函数为f′(x),且满足f(x)=2x2-xf′(2),则f...
已知函数f(x)的导函数为f′(x),且满足f(x)=2x2-xf′(2),则f′(5)= .
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已知单位向量
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,
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的夹角为120°,当|2
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+x
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|(x∈R)取得最小值时x=
.
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设函数
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,则不等式f(x)≤2的解集为
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在△ABC中,角A,B,C所对的边分别为a,b,c,若a=1,b=
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,
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,则B=
.
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对于函数y=f(x)(x∈I),y=g(x)(x∈I),若对于任意x∈I,存在x
,使得f(x)≥f(x
),g(x)≥g(x
)且f(x
)=g(x
),则称f(x),g(x)为“兄弟函数”.已知函数
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是定义在区间
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上的“兄弟函数”,那么函数f(x)在区间
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上的最大值为( )
A.
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B.2
C.4
D.
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定义平面向量之间的一种运算“⊙”如下:对任意向量
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572800174/SYS201311031022385728001010_ST/0.png)
=(x
1,y
1),
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=(x
2,y
2),令
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⊙
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572800174/SYS201311031022385728001010_ST/3.png)
=x
1y
2-x
2y
1,则下列说法错误的是( )
A.对任意的λ∈R,(λ
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)⊙
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=
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⊙(λ
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)
B.
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⊙
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=
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⊙
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C.(
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⊙
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103102238572800174/SYS201311031022385728001010_ST/13.png)
)
2+
2=|
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|
2|
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|
2D.若
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与
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共线,则
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⊙
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=0
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