(1/3+1/3)÷(1/3+1/3)=1
(1/3+1/3)-(1/3+1/3)=0
(1/3+1/3+1/3)÷1/3=3
(1/3÷1/3)+(1/3÷1/3)=2
1/3÷1/3÷1/3÷1/3=9