1 3 a 4 ) ( 2 7a 6 July 8, 2019 16 32 64 128 1 3 a 4 )+( 2 7a 6 A 1 2 3 4 5 6 3a-4/a-1 + 7-4a/a-1 1) (4a)/7 + 1/2
