5 7 4 21 July 8, 2019 16 32 64 128 X 5 7 4 21 5 4 7 21 3x )= 41 7 )( 5 )= 2 4 21 4 7 1 5 21 4 5 y 7 4 chia 21 8 4 5 y 7 4 21 8
