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观察下列等式:13+23=32,13+23+33=62,13+23+33+43=...
观察下列等式:13+23=32,13+23+33=62,13+23+33+43=102,…,根据上述规律,第五个等式为 .
考点分析:
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已知向量
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=(2,-1),
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=(-1,m),
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=(-1,2),若(
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+
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)∥
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,则m=
.
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在△ABC中,M是BC的中点,AM=1,点P在AM上且满足向量
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=2
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,则向量
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(
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+
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)等于( )
A.
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B.
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C.
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D.
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若3sinα+cosα=0,则
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的值为( )
A.
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B.
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C.
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D.-2
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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)=( )
A.-3
B.-1
C.1
D.3
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设不等式x
2-x≤0的解集为M,函数f(x)=ln(1-|x|)的定义域为N,则M∩N为( )
A.[0,1)
B.(0,1)
C.[0,1]
D.(-1,0]
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