One third + two-thirds of the square of three + three-thirds of the power of three +. + three of the power of six is equal to how much, in not calculate?

One third + two-thirds of the square of three + three-thirds of the power of three +. + three of the power of six is equal to how much, in not calculate?

Original form=
(1/3+...+1/3^6)+(1/3^2+...+1/3^6)+(1/3^3+...+1/3^6)+(1/3^4+...+1/3^6)+(1/3^5+1/3^6)+1/3^6
Each is an equal ratio sequence, common ratio 1 / 3, can you forget it