Salut qui peut m'aider je n'arrive pas du tout svp​

Bonjour,

A = 3/5 – 2/3 × 9/4

A = 3/5 – 18/12 or 18/12 = 6/4 = 3/2

A = 3/5 – 3/2

A = 6/10 – 15/10

A = -9/10

B = (1 – 3/2)/(1 + 4/3)

B = (2/2 – 3/2) / (3/3 + 4/3)

B = (-1/2) / (7/3)

B = -1/2 × 3/7

B = -3/14

C = (10² × 15 × 10) / (5 × 10-¹)

C = (10³ × 15)/(5 × 10-¹)

C = 10³/10-¹ × 15/5

C = 10⁴ × 3

C = 30 000