Bjr pouvez vous m aider svp exercice 19

Bonsoir,

a. 1 + 2/3

= (1 x 3) / (1 x 3) +2/3

= 3/3 + 2/3

= 5/3

b. 1 - 3/4

= (1 x 4) / (1 x 4) - 3/4

= 4/4 - 3/4

= 1/4

c. 1 - 2/7

= (1 x 7) / (1 x 7) - 2/7

= 7/7 - 2/7

= 5/7

d. 1/3 + 3/4

= (1 x 4) / (3 x 4) + (3 x 3) / (4 x 3)

= 4/12 + 9/12

= 13/12

e. - 2/5 + 1/6

= (2 x 6) / (5 x 6) + (1 x 5) / (6 x 5)

= 12/30 + 5/30

= 17/30

f. 9/2 - 13/7

= (9 x 7) / (2 x 7) - (13 x 2) / (7 x 2)

= 63/14 - 26/14

= 37/14