在等差数列{an}中,cn=a1+a2+…+ann也成等差数列,那么在等比数列{ 发布时间:2017-05-18 11:44 │ 来源:www.tikuol.com 题型:选择题 问题: 在等差数列{an}中,cn=a1+a2+…+ann也成等差数列,那么在等比数列{bn}中,下列推断正确的是( )A.数列dn=b1+b2+…+bnn成等差数列B.数列dn=b1+b2+…+bnn成等比数列C.数列dn=b1•b2…bnn成等比数列D.数列dn=b1•b2…bn成等比数列
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