解:由已知新运算:x*y=ax+by+xy,其中a,b是常数,且2*1=2a +b +2 =7,(-3)*3=-3a +3b -9 =3,解方程组得a =1/3b =13/3故1/3*6=1/3*1/3+6*13/3+1/3*13/3=248/9