Bonjour. A=-2/21*14/5-8/5 B=1/4+5/3*-1/8 C=4/-3+-7/6*-2/5 D=(8/15-7/5)*(-1/6+2/9 Merci de m'aider svp

Réponse :

Explications étape par étape

Bonsoir

A = -2/21 x 14/5 - 8/5

A = -2/5 x 14/21 - 8/5

A = -2/5 x (2 x 7)/(3 x 7) - 8/5

A = -2/5 x 2/3 - 8/5

A = -4/15 - (8 x 3)/(5 x 3)

A = -4/15 - 24/15

A = -28/15

B = 1/4 + 5/3 x -1/8

B = 1/4 - 5/24

B = 6/24 - 5/24

B = 1/24

C = -4/3 + (-7/6) x (-2/5)

C = -4/3 + 2/6 x 7/5

C = -4/3 + 2/(3 x 2) x 7/5

C = -4/3 + 1/3 x 7/5

C = -4/3 + 7/15

C = (-4 x 5)/(3 x 5) + 7/15

C = -20/15 + 7/15

C = -13/15

D = (8/15 - 7/5) x (-1/6 + 2/9)

D = (8/15 - (7 x 3)/(5 x 3)) x [(-1 x 3)/(6 x 3) + (2 x 2)/(2 x 9)]

D = (8/15 - 21/15) x (-3/18 + 4/18)

D = (-3/15 x 1/18)

D = (-1/5) x 1/18

D = -1/90