1 . 判断下列数列是否为等比数列:
(1)9,0.9,0.09,0.009;
(2),,,;
(3),,,;
(4),,,.
(1)9,0.9,0.09,0.009;
(2),,,;
(3),,,;
(4),,,.
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2 . 已知是各项均为正数的等比数列,公比为q,求证:是等比数列,并求该数列的公比.
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