(1/3-1/3)×1/3×1/3=01/3×1/3÷1/3÷1/3=1(1/3÷1/3)+(1/3÷1/3)=2(1/3+1/3+1/3)÷1/3=3(1/3+1/3)÷1/3÷1/3=61/3÷1/3÷1/3÷1/3=9
1/3+1/3-1/3-1/3=0（1/3÷1/3)+(1/3÷1/3）=21/3×1/3÷1/3÷1/3=11/3÷（1/3×1/3×1/3）=9
