Bonjour,
400/2 = 200
20/2 = 10
100/2 =50
50/2 = 25
25/5 = 5
=> 2*2*2*2*5*5
2²*2² *5²
= 20² = 400
√400 =20
576/2 =288
288/2 =144
144/2 =72
72/2=36
36/2= 18
18/2 = 9
9/3=3
2*2*2*2*2*2*3*3
2²*2²*2²*3²
24²
√576 = 24
2 500/2=1 250
1 250/2=625
625/5 = 125
125/5 =25
25/5 =5
=> 2*2*5*5*5*5
2²*5²*5²
50²
√2 500 =50