9 2 7 4 2 3 July 8, 2019 16 32 64 128 9 2 2 3 x 7 4 9 5 7 4 2 3 (- 9 2 3 x 3 3 5 7 4 2 Х 4 2 )+ 3 7 =- 2 9 7 4 t 2 )- 3t =- 9 2 9 x 2 2 4 3x 7 2
