Bonjour/Bonsoir j'ai un dm à rendre pour demain mais je n'arrive pas a faire l'exercice 1 , merci encore ! ​

Bonjour,

A = 6/7 - 4/7 : 2/5

A = 6/7 - 4/7 x 5/2

A = 6/4 - 20/14

A = (6 x 7) / (4 x 7) - (20 x 2) / (14 x 2)

A = 42/28 - 40/28

A = 2/28

A = (2 x 1) / (2 x 14)

A = 1/14

B = 4/3 + 5/2 x 7/15

B = 4/3 + 35/30

B = (4 x 10) / (3 x 10) + 35/30

B = 40/30 + 35/30

B = 75/30

B = (15 x 5) / (15 x 2)

B = 5/2

C = 34/5 : (4/5 - 3/8)

C = 34/5 : [(4 x 8) / (5 x 8) - (3 x 5) / (8 x 5)]

C = 34/5 : (32/40 - 15/40)

C = 34/5 : 17/40

C = 34/5 x 40/17

C = 1360/85

C = (85 x 16) / (85 x 1)

C = 16

D = 2/5 + 3/5 : (1 - 1/10)

D = 2/5 + 3/5 : [(1 x 10) / (1 x 10) - 1/10]

D = 2/5 + 3/5 : (10/10 - 1/10)

D = 2/5 + 3/5 : 9/10

D = 2/5 + 3/5 x 10/9

D = (2 x 9) / (5 x 9) + 30/45

D = 18/45 + 30/45

D = 48/45

D = (3 x 16) / (3 x 15)

D = 16/15.