Réponses

2014-09-14T15:57:56+02:00
B= -20 -17 + (12-5*3)-(9-7*3)
  = -20 -17 +(12-15)-(9 +21)
  = -20 -17 +(-3) -(30)
  = -20 -17 -3 +12
  = -28

C= 40-(18-6*4)-11
  = 40-(18-24)-11
  = 40 -(-6) -11
  = 40 +6 -11
  = 35