4 2 3 x 60 July 8, 2019 16 32 64 128 4 5 x 1 60 2 3 3 4 2 3 x 5 2 60 3 4 x 2 5 x 600 3 4 2 5 x 29 60 45 ( 4 3 x 60 12 2 ) 32 4 x 7 2 1 3 x 60 3 4 2 phần 5 x 29 60 4 2 x 60 4 + 4 = 6