5 3 4 x 7 1 8 July 8, 2019 16 32 64 128 1 2 3 x 4 5 6 7 8 5 6 x 9 )+ 3 4 x 1 )- 7 9 8 5 3 4 x 1 8 x 7 8 grinding wheel 7 1 2 5 3 4 x 8 1 8 3 4 x 1 5 8 x 7 16 bearing 4 7 x 6 5 1 3 8 3 1 và 3 4 x 7 8 5 7 1 2 5 3 4 x 8 0 20 5 x 7 = 35
