a(n+1)=2an/(an+2)
1/a(n+1)=(an+2)/(2an)=1/an+1/2
1/a(n+1)-1/an=1/2,为定值.
1/a1=1/1=1
数列{1/an}是以1为首项,1/2为公差的等差数列.
1/an=1/a1+(n-1)(1/2)=1+(n-1)/2=(n+1)/2
an=2/(n+1)
a5=2/(5+1)=2/6=1/3