9 ,0.9,0.09,0.009是否为等比数列

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9 ,0.9,0.09,0.009是否为等比数列
9 ,0.9,0.09,0.009是否为等比数列

9 ,0.9,0.09,0.009是否为等比数列
an=9*(1/10)^(n-1) (n≥1)

是的 1:0.1

是的,等比是1/10

是的,公比为0.1

不知道,哈哈

是。是公比为0.1的等比数列。