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一个扇形的弧长为5cm,它的面积为5cm2,则这个扇形的圆心角的弧度数是 .
一个扇形的弧长为5cm,它的面积为5cm2,则这个扇形的圆心角的弧度数是 .
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已知函数y=f(x)的图象如图,则函数
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在[0,π]上的大致图象为( )
A.
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B.
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C.
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D.
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=(-x,1),
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A.(-∞,-2]∪[2,+∞)
B.(-∞,-2)∪(2,+∞)
C.(-2,2)
D.[-2,2]
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的值为( )
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C.-1
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已知
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,
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的值为( )
A.
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B.
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C.
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D.
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B.
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C.
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D.
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