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下列结论错误的是( ) A.命题“若p,则q”与命题“若¬q,则¬p”互为逆否命...
下列结论错误的是( )
A.命题“若p,则q”与命题“若¬q,则¬p”互为逆否命题
B.命题p:∀x∈[0,1],ex≥1,命题q:∃x∈R,x2+x+1<0,则p∨q为真
C.“若am2<bm2,则a<b”的逆命题为真命题
D.若p∨q为假命题,则p、q均为假命题
考点分析:
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若某程序框图如右图所示,则该程序运行后输出的B等于( )
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A.63
B.31
C.15
D.7
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函数
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在
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上的最大值为( )
A.1
B.2
C.
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D.
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下列关于数列的命题
①若数列{a
n}是等差数列,且p+q=r(p,q,r为正整数)则a
p+a
q=a
r②若数列{a
n}满足a
n+1=2a
n,则{a
n}是公比为2的等比数列
③2和8的等比中项为±4
④已知等差数列{a
n}的通项公式为a
n=f(n),则f(n)是关于n的一次函数
其中真命题的个数 为( )
A.1
B.2
C.3
D.4
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已知向量
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=(2,1),
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=10,|
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+
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|=
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,则|
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|=( )
A.
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B.
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C.5
D.25
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下列叙述正确的是( )
A.y=tanx的定义域是R
B.
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的值域为R
C.
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的递减区间为(-∞,0)∪(0,+∞)
D.y=sin
2x-cos
2x的最小正周期是π
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