在等差数列{an}中,a2=5,a4=7,则a6=( )。A.9 B.10 C.11 D.12

作者: tihaiku 人气: - 评论: 0
问题 在等差数列{an}中,a2=5,a4=7,则a6=( )。
选项 A.9 B.10 C.11 D.12
答案 A
解析 根据等差数列性质,a4是a2和a6的等差中项,易得a6=9,选择A。若am,an,ap为等差数列{an}的项,并且m,n,p呈等差数列,则an是am,ap的等差中项。

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