数列{an}是正项等差数列,若bn=a1+a2+a3+……+an/n则数列{bn}也为等差数列,类比上述结论,写出正项等比数列{cn},若dn=________,则数列{dn}也为等比数列

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数列{an}是正项等差数列,若bn=a1+a2+a3+……+an/n则数列{bn}也为等差数列,类比上述结论,写出正项等比数列{cn},若dn=________,则数列{dn}也为等比数列
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数列{an}是正项等差数列,若bn=a1+a2+a3+……+an/n则数列{bn}也为等差数列,类比上述结论,写出正项等比数列{cn},若dn=________,则数列{dn}也为等比数列
数列{an}是正项等差数列,若bn=a1+a2+a3+……+an/n
则数列{bn}也为等差数列,类比上述结论,写出正项等比数列{cn},若dn=________,则数列{dn}也为等比数列

数列{an}是正项等差数列,若bn=a1+a2+a3+……+an/n则数列{bn}也为等差数列,类比上述结论,写出正项等比数列{cn},若dn=________,则数列{dn}也为等比数列
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