3 4-9×=1 6 July 8, 2019 16 32 64 128 3 4 9 1 6 3 4 9 2 1 6 3 4 9 1 5 6 3 7 9 4 1 6 1 3 4 9 6 8 7x 3 4 9 1 6 3 4/9 - 1 6/9
