bonjour je suis en 4 eme mais je n'arrive pas a faire mon exercice de maths qui celui ci est noté! pourriez vous m'aider alors il s'agit de calculer les fractio

Bonjour,

H:7/8 - -5/3

= 7/8 + 5/3

= (7 x 3) / (8 x 3) + (5 x 8) / (3 x 8)

= 21/24 + 40/24

= 61/24

I: -3/10 + -9/8 + 7/5 + 3/2

= (- 3 x 4) / (10 x 4) - (9 x 5) / (8 x 5) + (7 x 8) / (5 x 8) + (3 x 20) / (2 x 20)

= - 12/40 - 45/40 + 56/40 + 60/40

= - 57/40 + 116/40

= 59/40

K: 1/-8 + 5/4 + -7/6

= (1 x 3) / (- 8 x 3) + (5 x 6) / (4 x 6) - (7 x 4) / (6 x 4)

= 3/- 24 + 30/24 - 28/24

= - 3/24 - 28/24 + 30/24

= - 31/24 + 30/24

= - 1/24

L: 1 + -15/7 + -3/-5

= (1 x 35) / (1 x 35) - (15 x 5) / (7 x 5) + (3 x 7) / (5 x 7)

= 35/35 - 75/35 + 21/35

= 35/35 + 21/35 - 75/35

= 56/35 - 75/35

= - 19/35

M: -2 + 5/6 - 23/10 - 3/-5

= (- 2 x 30) / (1 x 30) + (5 x 5) / (6 x 5) - (23 x 3) / (10 x 3) + (3 x 6) / (5 x 6)

= - 60/30 + 25/30 - 69/30 + 18/30

= - 60/30 - 69/30 + 25/30 + 18/30

= - 129/30 + 43/30

= - 86/30

= (2 x - 43) / (2 x 15)

= - 43/15

N: 5/6 - 5/8 - 5/24

= (5 x 4) / (6 x 4) - (5 x 3) / (8 x 3) - 5/24

= 20/24 - 15/24 - 5/24

= 20/24 - 20/24

= 0

P; -11 + 1/11 + 1/6 - 6

= (- 11 x 66) / (1 x 66) + (1 x 6) / (11 x 6) + (1 x 11) / (6 x 11) - (6 x 66) / (1 x 66)

= - 726/66 + 6/66 + 11/66 - 396/66

= - 726/66 - 396/66 + 6/66 + 11/66

= - 1122/66 + 17/66

= - 1105/66

R: 2/3 - -7/4 - 1/5

= (2 x 20) / (3 x 20) + (7 x 15) / (4 x 15) - (1 x 12) / (5 x 12)

= 40/60 + 105/60 - 12/60

= 145/60 - 12/60

= 133/60