问题
填空题
等比数列a+log23，a+log43，a+log83的公比是______．
答案
q=
=a+log43 a+log23
=a+log83 a+log43
=(a+log43)-(a+log83) (a+log23)-(a+log43)
=log43-log83 log23-log43
=(
-1 2
)log231 3 (1-
)log231 2
．1 3
故答案为
．1 3
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