Bonsoir vous pourriez m’aider pour le 1er exercice de ce DM merci.

Bonsoir,

a) A = - 2/3 - - 5/- 3

A = - 2/3 - 5/3

A = - 7/3

b) B = - 7/5 - - 7/10

B = - 7/5 + 7/10

B = (- 7 x 2) / (5 x 2) + 7/10

B = - 14/10 + 7/10

B = - 7/10

c) C = - 5/20 + 9/- 6

C = - 5/20 - 9/6

C = (- 5 x 3) / (20 x 3) - (9 x 10) / (6 x 10)

C = - 15/60  - 90/60

C = - 105/60

C = (15 x - 7) / (15 x 4)

C = - 7/4

d) D = 8/5 - 3/7

D = (8 x 7) / (5 x 7) - (3 x 5) / (7 x 5)

D = 56/35 - 15/35

D = 41/35

e) E = - 4/6 - (10/ - 3 - 9/2)

E = - 4/6 - (- 10/3 - 9/2)

E = - 4/6 - [(- 10 x 2) / (3 x 2) - (9 x 3) / (2 x 3)]

E = - 4/6 - (- 20/6 - 27/6)

E = - 4/6 - (- 47/6)

E = - 4/6 + 47/6

E = 43/6

f) F = (1/6 + 1/7) - (5/6 - 9/7)

F = [(1 x 7) / (6 x 7) + (1 x 6) / (7 x 6)] - [(5 x 7) / (6 x 7) - (9 x 6) / (7 x 6)]

F = (7/42 + 6/42) - (35/42 - 54/42)

F = 13/42 - (- 19/42)

F = 13/42 + 19/42

F = 32/42

F = (2 x 16) / (2 x 21)

F = 16/21.