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设数列{an}是各项互不相等的等比数列,a1=9,a2+a3=18,则公比q等于A.-2B...
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设数列{a
n}是各项互不相等的等比数列,a
1=9,a
2+a
3=18,则公比q等于( )
A.-2
B.-1
C.
D.1
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