Réponses

2014-09-09T20:43:56+02:00
A = (- 4 + 6/7) / (3/14)
A = (- 4 x 7 / 1 x 7 + 6/7) / 3/14
A = (- 28/7 + 6/7) / 3/14
A = - 22/7 x 4/3
A = - 88/21
A = 3 x - 96 / 3 x 7
A = - 96/7

B = 4 - (2 - 5)²
B = 4 - (4 - 25)
B = 4 - (- 21)
B = 4 + 21
B = 17

C = 3/7 + 4/21 - 5/2
C = 3 x 6 / 7 x 3 + 4 x 2 / 21 x 2 - 5 x 21 / 2 x 21
C = 18/21 + 8/21 - 105/21
C = - 79/21