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