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若命题P:函数f(x)=x3-ax-2在区间(1,+∞)内是增函数;则命题P成立...
若命题P:函数f(x)=x3-ax-2在区间(1,+∞)内是增函数;则命题P成立的充要条件是( )
A.a∈(-∞,3]
B.a∈(-∞,9]
C.a∈(-1,∞)
D.a∈(-∞,3)
考点分析:
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设f′(x)是函数f(x)的导函数,y=f′(x)的图象如图所示,则y=f(x)的图象最有可能的是( )
A.
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B.
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C.
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D.
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已知双曲线
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的一条渐近线是
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,则双曲线的离心率为( )
A.2
B.
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C.
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D.
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下列说法错误 的是( )
A.如果命题“¬p”与命题“p或q”都是真命题,那么命题q一定是真命题
B.命题p:∃x
∈R,x
2-2x
+4<0,则¬p:∀x∈R,x
2-2x+4≥0
C.命题“若a=0,则ab=0”的否命题是:“若a≠0,则ab≠0”
D.特称命题“∃x∈R,使-2x
2+x-4=0”是真命题
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双曲线
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A.(0,±3)
B.(±3,0)
C.(±1,0)
D.(0,±1)
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与直线4x-y+3=0平行的抛物线y=2x
2的切线方程是( )
A.4x-y+1=0
B.4x-y-1=0
C.4x-y-2=0
D.4x-y+2=0
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