Réponse :
bonjour
A = 2/5 x 3 /25 + 2/5 x 22/25
A = 6/125 + 44/125
A = 50/125 = 10/25
A = 2/5 ( 3 /25 + 22/25)
A = 2/5 x 25/25
A = 50/ 125 = 10/25
B = 3/5 x 3/4 - 3/4 x 2/5
B = 9/20 - 6 /20
B = 3 /20
B = 3/4 ( 3/5 - 2/5 )
B = 3/4x 1/5 = 3/20
Explications étape par étape
