1 6 2 3 x 8 9 July 8, 2019 16 32 64 128 1 2 3 4 x 6 7 8 9 1 3 2 5 x 8 9 2 3 5 6 6 1 4 x 2 3 )= 9 3 8 2 4 6 x 3 1 5 x 9 8 6 1+(-8 3)
