Je suis en quatrième et j'aurai besoin d'aide svp pour un exercice​

Bonjour,

A = 33/60 : 22/45

A = 33/60 x 45/22

A = 1 485/1 320

A = (165 x 9) / (165 x 8)

A = 9/8

B = - 4/3 - 5/6 + 11/8

B = (- 4 x 8) / (3 x 8) - (5 x 4) / (6 x 4) + (11 x 3) / (8 x 3)

B = - 32/24 - 20/24 + 33/24

B = - 19/24

C = 18/40 x - 30/21 x 77/- 15

C = - 540/840 x - 77/15

C = 41 580/12 600

C = (1 260 x 33) / (1 260 x 10)

C = 33/10

D = 3/4 - 5/6 : 15/8

D = 3/4 - 5/6 x 8/15

D = 3/4 - 40/90

D = 3/4 - (10 x 4) / (10 x 9)

D = 3/4 - 4/9

D = (3 x 9) / (4 x 9) - (4 x 4) / (9 x 4)

D = 27/36 - 16/36

D = 11/36

E = 2 + 5 : (1 + 2/3)

E = 2 + 5 : [(1 x 3) / (1 x 3) + 2/3]

E = 2 + 5 : (3/3 + 2/3)

E = 2 + 5 : 5/3

E = 2 + 5 x 3/5

E = 2 + 15/5

E = 2 + 3

E = 5

F = (- 7/5 + 4/3) / (7 - 4/3)

F = [(- 7 x 3) / (5 x 3) + (4 x 5) / (3 x 5)] :  [(7 x 3) / (1 x 3) - 4/3]

F = (- 21/15 + 20/15) : (21/3 - 4/3)

F = - 1/15 : 17/3

F = - 1/15 x 3/17

F = - 3/255

F = (3 x - 1) / (3 x 85)

F = - 1/85.