Bonjour jai un exercice que je n'arrive pas a faire : a = 2 sur 7 - 3 sur 7 × 14 sur 9 b = -7 sur 8 × (2 sur 4 - 1) c = 4 sur 5 × 1 sur 4 + 2 sur 5 help svpp​

Bonjour,

a = 2/7 - 3/7 × 14/9

a = 2/7 - 42/63

a = (2 x 9) / (7 x 9) - 42/63

a = 18/63 - 42/63

a = - 24/63

a = (3 x - 8) / (3 x 21)

a = - 8/21

b = -7/8 × (2/4 - 1)

b = - 7/8 x [2/4 - (1 x 4) / (1 x 4)]

b = - 7/8 x (2/4 - 4/4)

b = - 7/8 x (- 2/4)

b = 14/32

b = (2 x 7) / (2 x 16)

b = 7/16

c = 4/5 × 1/4 + 2/5

c = 4/20 + (2 x 4) / (5 x 4)

c = 4/20 + 8/20

c = 12/20

c = (4 x 3) / (4 x 5)

c = 3/5.