4 1 7 x 3 1 9 July 8, 2019 16 32 64 128 2 4 7 х 3 1 9 4 x − 1 2 1 3 7 9 4/7 x 3 1/9 4 1/2 + 1 1/3 4 1/7 x 4 3/4 4 1/3 x 7 4 1/7 x 4
