Exercice 56 urgent svp

bonjour

a) 19 x 43,5 + 19 x 56.5 = 19 x 100 = 1 900

b) 16.7 x 69 - 6.7 x 69 = 10 x 69 = 690

c) 13 x 5.4 + 8.1 x 13 - 3.5 x 13 = 10 x 13 = 130