已知集合A={a,b,c},则集合A的真子集的个数是 .
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下列函数图象与x轴均有交点,其中不能用二分法求图中交点横坐标的是( )
A.
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B.
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C.
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D.
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已知函数f(x)=
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,若f(a)=
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,则实数a的值为( )
A.-1
B.
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C.-1或
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D.1或-
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函数f(x)=2
x-3零点所在的一个区间是( )
A.(-1,0)
B.(0,1)
C.(1,2)
D.(2,3)
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函数y=x
2-2x,x∈[0,+∞)的值域是( )
A.[1,+∞)
B.(-∞,-1]
C.[-1,+∞)
D.[-1,0]
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函数f(x)的定义域为(a,b),且对其内任意实数x
1,x
2均有:(x
1-x
2)[f(x
1)-f(x
2)]<0,则f(x)在(a,b)上是( )
A.增函数
B.减函数
C.奇函数
D.偶函数
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