Bonsoir pouvez-vous m'aidez: A=13/8+5/2+3/4 B=5/12+11/24+1/6 C= 2+3/7+11/14 D=3/5-4/15-7/30 A= B=

Bonjour,

A=13/8+5/2+3/4

A = 13/8 + (5 x 4) / (2 x 4) + (3 x 2) / (4 x 2)

A = 13/8 + 20/8 + 6/8

A= 39/8

B=5/12+11/24+1/6

B = (5 x 2) / (12 x 2) + 11/24 + (1 x 4) / (6 x 4)

B = 10/24 + 11/24 + 4/24

B = 25/24

C= 2+3/7+11/14

C = (2 x 14) / (1 x 14) + (3 x 2) / (7 x 2) + 11/14

C = 28/14 + 6/14 + 11/14

C= 45/14

D=3/5-4/15-7/30

D = (3 x 6) / (5 x 6) - (4 x 2) / (15 x 2) - 7/30

D = 18/30 - 8/30 - 7/30

D = 3/30

D = (3 x 1) / (3 x 10)

D = 1/3

E=14/9+2/3-5/18

E = (14 x 2) / (9 x 2) + (2 x 6) / (3 x 6) - 5/18

E = 28/18 + 12/18 - 5/18

E = 35/18

F= 1-9/34+3/2

F = (1 x 34) / (1 x 34) - 9/34 + (3 x 17) / (2 x 17)

F = 34/34 - 9/34 + 51/34

F = 76/24

F = (2 x 38) / (2 x 17)

F = 38/17.