Bonjour, Quelqu’un pour m’aider svp? L’exercice numéro 1, 1) et 2) Merci beaucoup à ceux qui m’aideront.

Réponse :

Explications étape par étape :

Bonjour

A = 2 - 5/4 × 1/10

A = 2 - 5/40

A = 2 - 5 / (5 × 8)

A = 2 -1/8

A = 16/8 - 1/8

A = 15/8

B = 3/5 - 2/5 × 3/10

B = 3/5 - (2 × 3) / (5× 10)

B = 3/5 - (2×3)/(5×2×5)

B = 3/5 - 3/25

B = 15/25 - 3/25

B = 12/25

C = 3/5 - (2/5) / (3/10)

C = 3/5 - (2/5) × (10/3)

C = 3/5 - (2×10) /(5×3)

C = 3/5 - (2×5×2) /(5×3)

C = 3/5 - 4/3

C = 9/15 - 20/15

C = -11/15

D = (2/3 + 5/7) ×3/4 -3/4

D = (14/21 +15/21) × 3/4 - 3/4

D = (29/21) × 3/4 - 3/4

D = 87/84 - 3/4

D = 87/84 - 63/84

D = 24/84

D =12/42

D =2/7

b)

1/a + 1/b + 1/c

a = 2/3 b = -3/2 c = -3/4

1/(2/3) + 1/ (-3/2) + 1/(-3/4) = 3/2 -2/3 -4/3 = 3/2 - 6/3 = 3/2 - 2 = 3/2 - 4/2 = -1/2