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执行如图的程序框图,输出y的值是( )
A.15
B.31
C.63
D.127
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已知等比数列{a
n }的公比为2,前4项的和是1,则前8项的和为( )
A.15
B.17
C.19
D.21
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已知角α的终边与单位圆交于
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,则cosα的值为( )
A.
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B.
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C.
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D.
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设集合A={x|-1≤x<5,x∈R},B={x|x<-1或x>4,x∈R},则A∪B是( )
A.{x|4<x<5}
B.{x|x>4}
C.{x|x<-2}
D.R
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已知幂函数的图象过点(2,4),则其解析式为( )
A.y=x+2
B.y=x
2C.
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D.y=x
3
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