Sagot :

Bonjour,

A= -1/20 + 16/20  = 15/20 = 3/4

B=  -3/4 -8/4 = -11/4

C= 25/30 +1/30 = 26/30 = 13/15

D= 19/28 -12/28 = 7/28 = 1/4

E= 63/1 + 2/81 = 65/81

F= 31/9 - 27/9 = 4/9

mila72

Réponse :

Explications étape par étape

A= -1/20 +4/5

A= -1/20 + 4x4/5x4

A= -1/20 + 16/20

A= 15/20

A= 3/4

B= -3/4-2

B= -3/4 - 2x4/4

B= -3/4 - 8/4

B= -11/4

C= 5/6+ 1/30

C= 5x5/6x5 +1/30

C= 25/30 + 1/30

C= 26/30

C= 13/15

D= 19/28 - 3/7

D= 19/28 - 3x4/7x4

D= 19/28 - 12/28

D= 7/28

E= 7/9 - -2/81

E= 7x9/9x9 - -2/81

E= 63/81 - -2/81

E= 65/81

F= 31/9 -3

F= 31/9 -3x9/9

F= 31/9- 27/9

F= 58/9