数列{an}中,a2=2,a6=0且数列{1\an+1}是等差数列,则a4等于
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![数列{an}中,a2=2,a6=0且数列{1\an+1}是等差数列,则a4等于](/uploads/image/z/5459902-70-2.jpg?t=%E6%95%B0%E5%88%97%EF%BD%9Ban%7D%E4%B8%AD%2Ca2%3D2%2Ca6%3D0%E4%B8%94%E6%95%B0%E5%88%97%EF%BD%9B1%5Can%2B1%7D%E6%98%AF%E7%AD%89%E5%B7%AE%E6%95%B0%E5%88%97%2C%E5%88%99a4%E7%AD%89%E4%BA%8E)
数列{an}中,a2=2,a6=0且数列{1\an+1}是等差数列,则a4等于
数列{an}中,a2=2,a6=0且数列{1\an+1}是等差数列,则a4等于
数列{an}中,a2=2,a6=0且数列{1\an+1}是等差数列,则a4等于
1/(a2+1)=1/3,1/(a6+1)=1,所以d=(1-1/3)/4=1/6
1/(a4+1)=1/(a2+1)+2d=2/3,所以a4=0.5