Réponse :
Explications étape par étape
Bonsoir
Calculer :
A = -3V112 + 3V63 + 4V28
A = -3V(16 x 7) + 3V(9 x 7) + 4V(7 x 4)
A = -3V(4^2 x 7) + 3V(3^2 x 7) + 4V(7 x 2^2)
A = -3 x 4V7 + 3 x 3V7 + 4 x 2V7
A = -12V7 + 9V7 + 8V7
A = (-12 + 9 + 8)V7
A = 5V7
B = V20 x V80 x V45
B = V(4 x 5) x V(16 x 5) x V(9 x 5)
B = V(2^2 x 5) x V(4^2 x 5) x V(3^2 x 5)
B = 2V5 x 4V5 x 3V5
B = (2 x 4 x 3) x (V5)^3
B = 24 x 5V5
B = 120V5
