Exercice 43 et 44 urgent svp

Exercice 43 : 
On sait que AB = 72mm

a) AM = 2/9 AB
AM = 2/9 × 72
AM = 16 mm
b) AN = 3/8 AB
AN = 3/8 × 72
AN = 27 mm
c) BP = 7/36 AB
BP = 7/36 × 72 
BP = 14 mm
d) BR = 5/12 AB
BR = 5/12 × 72
BR = 30 mm

Exercice 43 : 

a) 4/7 de 210 g = 4 ÷ 7 × 210 = 120g
b) 3/8 de 560 cL = 3 ÷ 8 × 560 = 210 cL
c) 15/4 de 24 m = 15 ÷ 4 × 24 = 90 m
d) 14/3 de 150 m² = 14 ÷ 3 × 150 = 700 m²