Bonsoir. Je suis bloqué sur cet exercice depuis quelques temps, pouvez vous m'aider s'il vous plaît ? Merci, piece jointe du devoir ci dessous.

Bonsoir,

A = (4/5 – 11/3) × 25/43

A = [(3×4)/(3×5) – (11×5)/(3×5)] × 25/43

A =(12 –55)/15 × 25/43

A = -43/15 × 25/43

A = (-43×25)/(15×43)

A = -25/15 = -(5×5)/(3×5) = -5/3

B = -2/5 ÷ 3/15 + 2/15

B = -2/5 × 15/3 + 2/15

B = (-2×15)/(5×3)+ 2/15

B = -30/15 + 2/15

B = -28/15

C = (-7/5)/[6+(1/5)]

C = (-7/5)/[(5×6)/5 + 1/5]

C = (-7/5)/(30/5+1/5)

C =(-7/5)/(31/5)

C = (-7/5)×(5/31)

C = -7/31

D = [(3/2 - 1/4)]/[2 - (1/2)]

D = [(3×2)/(2×2) - 1/4] / [(2×2)/2 - 1/2]

D = (6/4 - 1/4) / (4/2 - 1/2)

D = (5/4) / (3/2)

D = 5/4 × 2/3

D = 10/12 = 5/6