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
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。