5 x 2 21 July 8, 2019 16 32 64 128 5 x 2 216 5 2 x 21 4 2x 5 )( x 2 )= 21 7 5 x 2 21 3 5 x 2 21 2х 5 )( х 2 )= 21 5 2 x 1 )= 21 X 5 x 2 4x 21 5 8 21 x 2 9 14 2 5 x 10 21 5 x 2 2 9 21 X 5 root 21 2 X 5 √ 21 2 21 5 x 2 chia hết cho 3 2 5 x 210
