5-5/5-5/5=1*(5-5/5-5/5)=-2+5-5+5-5+5=3
5+5/5-5+5=(45-5-5-5)/5=55/5-5-5/5=6
(55-5-5)/5=75/5-5-5/5=8+55/5-5-5=9