1 2 + 3 4 1 1 - 6 8 8 9 * 7 4 20 16 / 20 16 0 1 - 9 11 3 3 - 6 6 3 3 / 6 6
(1/2)+(3/4)=5/4 (1/1)-(6/8)=1/4 (8/9)*(7/4)=14/9 (20/16)/(20/16)=1 (0/1)-(9/11)=-9/11 (3/3)-(6/6)=0 (3/3)/(6/6)=1