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设直线x=t与函数f(x)=x
2,g(x)=lnx的图象分别交于点M,N,则当|MN|达到最小时t的值为( )
A.1
B.
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C.
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D.
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直角坐标系xoy中,以原点为极点,x轴的正半轴为极轴建极坐标系,设点A,B分别在曲线
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(θ为参数)和曲线C
2:ρ=1上,则|AB|的最小值为( )
A.1
B.2
C.3
D.4
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设f(x)为定义在R上的奇函数,当x≥0时,f(x)=2
x+2x+b(b为常数),则f(-1)=( )
A.-3
B.-1
C.1
D.3
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设f(x)=
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,g(x)=
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,则f(g(π))的值为( )
A.1
B.0
C.-1
D.π
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下列四个命题中真命题是( )
①“若xy=1,则x、y互为倒数”的逆命题②“面积相等的三角形全等”的否命题③“若m≤1,则方程x
2-2x+m=0有实根”的逆否命题④“若A∩B=B,则A⊆B”的逆否命题.
A.①②
B.②③
C.①②③
D.③④
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