4 5 х 20 July 8, 2019 16 32 64 128 4 5 x 20 4 5 x 200 4 5 x 20 1 4 x 5 )= 20 4x 4 5 x 7 )= 20 4 5 x 8 )= 20 4 x 5 y 20 z 4 5 h 4 5×20 20×4 5