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若全集U=R,集合A={x||2x+3|<5},B={x|y=log3(x+2)...
若全集U=R,集合A={x||2x+3|<5},B={x|y=log3(x+2)},则CU(A∩B)=( )
A.{x|x≤-4或x≥1}
B.{x|x<-4或x>1}
C.{x|x<-2或x>1}
D.{x|x≤-2或x≥1}
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设m,n是两条不同的直线,α,β,γ是三个不同的平面.有下列四个命题:
①若α∥β,m⊂α,n⊂β,则m∥n;
②若m⊥α,m∥β,则α⊥β;
③若n⊥α,n⊥β,m⊥α,则m⊥β;
④若α⊥γ,β⊥γ,m⊥α,则m⊥β.
其中错误命题的序号是( )
A..①④
B..①③
C..②③④
D..②③
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已知非零向量
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、
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满足向量
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+
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与向量
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-
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的夹角为
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,那么下列结论中一定成立的是( )
A.
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=
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B.|
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|=|
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|,
C.
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⊥
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D.
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∥
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,则sinα-cosα的值( )
A.
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B.
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C.
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D.
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复数
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(i为虚数单位)的虚部是( )
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B.
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C.
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D.
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2(x>0);
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①求实数a,b的值;
②求函数
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上的最大值.
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都成立,求实数m的取值范围.
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