Réponses

2012-09-24T20:49:07+02:00

 

A = 7*8+9*(-9)+3

= 56 - 81 + 3

= -22

 

B = 7*8+9*(-9+3)

= 56 + 9*(-6)

= 56 - 54

= 2

 

C = (-48)/4 - 6/2

= -12 - 3

= -15

 

D =  (1/2 + 4/3)*6/5

= (3/6 + 8/6)*6/5

= (11/6) * 6/5

= 11/5

 

E = 1/9 - 15/9 *1/6

= 1/9 - 15/54

= 2/18 - 5/18

= -3/18

= -1/6

 

F = (-3/4 +1/2)  / (2/5 - 5/2)

= (-3/4 + 2/4) / (4/10 - 25/10)

= (-1/4) / (-21/10)

= (-1/4) * (-10/21)

= 5/42

 

En espérant t'avoir aidé.