bjr svp aidez moi je dois faire le 86 et 87​

Bonjour ! J'espère vous aider !

Réponse :

n°86 :

a) 3/48 + 5/6 = 3/48 + 5*8/6*8 = 3/48 + 40/48 = 43/48

b) 1/7 - 11/35 = 1*5/7*5 - 11/35 = 5/35 - 11/35 = -6/35

n°87 :

A = -1/20 + 4/5

A = -1/20 + 4*4/5*4

A = -1/20 + 16/20

A = 15/20

A = 3/4

B = -3/4 - 2

B = -3/4 - 2/1

B = -3/4 - 2*4/1*4

B = -3/4 - 8/4

B = -11/4

C = 5/6 + 1/30

C = 5*5/6*5 + 1/30

C = 25/30 + 1/30

C = 26/30

C = 13/15

D = 19/28 - 3/7

D = 19/28 - 3*4/7*4

D = 19/28 - 12/28

D = 7/28

D = 1/4

E = 7/9 - -2/81

E = 7/9 + 2/81

E = 7*9/9*9 + 2/81

E = 63/81 + 2/81

E = 65/81

F = 31/9 - 3

F = 31/9 - 3/1

F = 31/9 - 3*9/1*9

F = 31/9 - 27/9

F = 4/9