1/3^2-1/3^4=3^2/3^4-1/3^4=8/3^4
1/3^6-1/3^8=1./3^4.8/3^4=8/3^8
1/3^2014-1/3^2016=8/3^2004
A/8=1/3^4+1/3^8+...+..1/3^2004
A/(8.3^4)=1/3^8+1/3^12+..+1/3^2008
A(1/8-1/(8.3^4)=1/3^4-1/3^2008=(3^2004-1)/3^2008
10.A(1/3^4)=...
10A=(3^2004-1)/3^2004<1
vậy A<1/10=0,1