Bonjour !
[tex]240 = 10 \times 24 \\ = 2 \times 5 \times 2 \times 12 \\ = 2 \times 2 \times 5 \times 2 \times 6 \\ = 2 \times2 \times 2 \times 2 \times 3 \times 5 \\ \boxed{ = {2}^{4} \times 3 \times 5}[/tex]
[tex]322 = 2 \times 161 \\ \boxed{ = 2 \times 7 \times 23}[/tex]
[tex]3520 = 10 \times 352 \\ = 2 \times 5 \times 2 \times 176 \\ = 2 \times 2 \times 2 \times 5 \times 88 \\ = 2 \times 2 \times 2 \times 2 \times 5 \times 44 \\ = 2 \times 2 \times 2 \times 2 \times 5 \times 4 \times 11 \\ = 2 \times 2 \times 2 \times 2 \times 2 \times 2 \times 5 \times 11 \\ \boxed{ = {2}^{6} \times 5 \times 11}[/tex]
Bonne journée
