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已知△ABC的一个内角为120°,并且三边长构成公差为4的等差数列,则△ABC的...
已知△ABC的一个内角为120°,并且三边长构成公差为4的等差数列,则△ABC的面积为 .
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已知向量
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,
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满足(
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+2
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)•(
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-
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)=-6,且|
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|=1,|
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|=2,则
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与
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的夹角为
.
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如果执行如图所示的程序框图,输入x=4.5,则输出的数i=
.
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设f(x)是定义在R上的奇函数,当x≤0时,f(x)=2x
2-x.则f(1)=
.
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函数f(x)=ax
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2在区间(0.1)上的图象如图所示,则n可能是( )
A.1
B.2
C.3
D.4
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(x>2),在x=a处取最小值,则a=( )
A.1+
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B.1+
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C.3
D.4
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