过点(1,3)且在x轴的截距为2的直线方程是 .
考点分析:
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若函数f(x)=x
2-2x+m在[2,+∞)的最小值为-2,则实数m=
.
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已知函数f(x)=4-x
2,g(x)是定义在(-∞,0)∪(0,+∞)上的奇函数,当x>0时,g(x)=log
2x,则函数y=f(x)•g(x)的大致图象为( )
A.
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B.
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C.
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D.
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对于每个实数x,设f(x)取y=4x+1,y=x+2,y=-2x+4三个函数中的最小值,则f(x)的最大值为( )
A.
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B.
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C.
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D.
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函数f(x)=e
x-x-2的零点所在的区间为( )
A.(-1,0)
B.(1,2)
C.(0,1)
D.(2,3)
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一个底面是正三角形的三棱柱的正视图如图所示,则其体积等于( )
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A.6
B.2
C.
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D.
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