Réponses

2014-10-22T12:00:33+02:00
A)18 x ( 10 - 5 +2 )= 18 X 7 = 126      18 X (12 -5) = 18 X 7 = 126

b)36 x 12.5 + 36 x7.5 = (36 X 12,5) + (36 X 7,5) = 450 + 270 = 720