def standardise(self , other):
    if len(self.ListeMonomes) != 
            len(other.ListeMonomes):
        if len(self.ListeMonomes) == max( len(self.ListeMonomes) , len(other.ListeMonomes) ):
            for i in range(len(self.ListeMonomes)-len(other.ListeMonomes)):
                other.ListeMonomes += [ monome(0 , len(other.ListeMonomes) + i) ]
        else:
            for i in range(len(other.ListeMonomes)-len(self.ListeMonomes)):
                self.ListeMonomes += [ monome(0 , len(self.ListeMonomes) + i) ]
        
    P = [m.coef for m in self.ListeMonomes]
    Q = [m.coef for m in other.ListeMonomes]
    return polynome(*P) , polynome(*Q)