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在复平面内,设向量i(x1,x2,y1,y2∈R),则等于( ) A. B. C...
在复平面内,设向量
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i(x
1,x
2,y
1,y
2∈R),则
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等于( )
A.
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B.
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C.
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(
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)
D.
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(
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)
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已知集合A={y|y=log
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x,x>1},则A∪B等于( )
A.{y|0<y<
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}
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