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在等比数列{an}中,a2a6=400,a3=10,则a5=( ) A.40 B...
在等比数列{an}中,a2a6=400,a3=10,则a5=( )
A.40
B.-40
C.±40
D.20
考点分析:
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的一个通项公式是( )
A.
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B.
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C.
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D.
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在△ABC中,a=9,b=2
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,C=150°,则c=( )
A.
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B.7
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C.10
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D.8
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在△ABC中,A=30°,C=105°,b=8,则a=( )
A.4
B.
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C.
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D.
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在△ABC中,三内角A、B、C成等差数列,则角B等于( )
A.30°
B.60°
C.90°
D.120°
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下列数列哪个不是等差数列( )
A.1,1,1,1,1
B.4,7,10,13,16
C.
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D.-3,-2,-1,1,2
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