2 5 х 1 3 5 7 July 8, 2019 16 32 64 128 2 5 1 3 5 7 2 5 x 1 3 x 7 8 2 4 5 x 1 3 7 2 x 1 )- 3 2x 5 ) 7 3 * 5 х 3 2 * 5 х 1 77 3 1 5 х 5 8 2 7