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“x>0”是“x≠0”的( ) A.充分而不必要条件 B.必要而不充分条件 C....
“x>0”是“x≠0”的( )
A.充分而不必要条件
B.必要而不充分条件
C.充分必要条件
D.既不充分也不必要条件
考点分析:
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的是( )
A.
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B.
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C.
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D.
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已知{a
n}为等差数列,a
1+a
3+a
5=105,a
2+a
4+a
6=99,则a
20等于( )
A.-1
B.1
C.3
D.7
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若向量
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、
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满足|
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|=|
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|=1,
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与
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的夹角为60°,则
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=( )
A.
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B.
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C.
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D.2
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,则z=x+2y的最小值是( )
A.0
B.
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C.1
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A.8
B.4
C.
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D.
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