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知识梳理
考点自诊
1.判断下列结论是否正确,正确的画“√”,错误的画“×”. (1)满足an+1=qan(n∈ N+,q为常数)的数列{an}为等比数列. ( ) (2)G为a,b的等比中项⇔G2=ab. ( ) (3)等比数列中不存在数值为0的项. ( ) (4)如果{an}为等比数列,bn=a2n-1+a2n,那么数列{bn}也是等比数列. ( ) (5)如果数列{an}为等比数列,那么数列{ln an}是等差数列. ( ) (6)若数列{an}的通项公式是an=an,则其前n项和为 ( )
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