4 25 5 15 July 8, 2019 16 32 64 128 25 4 х 6 5 15 8 Х 5 25 4 15 25 5 4 x )= 15 3 5 ( х 4 25 )= 15 3 5 x 4 25 15 25 5 4 3x )= 15