calculer A: 15-20/2-4x3 B: 2x(-3)x(-5) /(-4)x5x3 Merci
A = 15 -20/2 -12
= 30/2 -20/2 -24/2 = -14/2 = -7
B = 2x*15*15 = 30x*15 = 450x
