Bonsoir pourriez-vous m'aider pour l'exercice 2 et 3 svp?

Bonsoir
exercice 2 )  A= -22 + (13-5) * (-5)   (on commence par la parenthese 13-5 )
                    A= -22 + 8 * (-5)            ( on multiplie 8 * (-5)
                    A = -22 + (-40)
                    A = -62

B= -28+(5-2)*(-4)                                         C= -3.2*(-6)+(-2.3-7.7)
   = -28+3*(-4)                                                = 19.2 +(-2.3-7.7)
  = -28+12                                                      = 19.2 +(-10)
  = -16                                                            = 9.2