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下列命题中错误的是( ) A.如果平面α⊥平面β,那么平面α内一定存在直线平行于...
下列命题中错误的是( )
A.如果平面α⊥平面β,那么平面α内一定存在直线平行于平面β
B.如果平面α不垂直于平面β,那么平面α内一定不存在直线垂直于平面β
C.如果平面α⊥平面γ,平面β⊥平面γ,α∩β=l,那么l⊥平面γ
D.如果平面α⊥平面β,那么平面α内所有直线都垂直于平面β
考点分析:
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若{
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、
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、
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}为空间的一组基底,则下列各项中,能构成基底的一组向量是( )
A.
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,
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+
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,
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B.
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,
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+
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,
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-
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C.
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,
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,
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D.
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,
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,
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+2
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某四棱锥的三视图如图所示,该四棱锥的表面积是( )
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A.32
B.16+16
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C.48
D.16+32
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四进制数201
(4)表示的十进制数的是( )
A.31
B.32
C.33
D.34
查看答案
由下列不等式:
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,
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,你能得到一个怎样的一般不等式?并加以证明.
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已知四棱锥P-ABCD的底面为直角梯形,AB∥DC,∠DAB=90°,PA⊥底面ABCD,且PA=AD=DC=
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AB=1,M是PB的中点.
(Ⅰ)证明:面PAD⊥面PCD;
(Ⅱ)求AC与PB所成的角;
(Ⅲ)求面AMC与面BMC所成二面角的大小.
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