J'ai besoin d'aide svp

Bonsoir,

6)
1 : 3/8
2: 1/6
3: 12/25

7)
7.25 = 725/100 

8)
5/7 x 735 = 3675/7 = 525

9)
900 = 2/3 de 600

9 x 3/8 = 3.375

de 3.375

10)

PGCD(72;45) = 72-45 = 45-27 = 27-18 = 18 - 9 = 9
PGCD(72;45)= 9