i是虚数单位,复数
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的模为( )
A.1
B.2
C.
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D.
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考点分析:
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设全集I={x|-3<x<3,x∈Z},A={1,2},B={-2,-1,2},则A∪(∁
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B.{1,2}
C.{2}
D.{0,1,2}
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在极坐标系中,已知直线l的极坐标方程为
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.
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如图所示,已知PA与⊙O相切,A为切点,过点P的割线交圆于B、C两点,弦CD∥AP,AD、BC相交于点E,F为CE上一点,且DE
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已知函数f(x)=ax
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与
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的大小.
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