Найдите значения выражения 1/5-1/6 3/4-1/3 7/9-2/11 3/4-4/9 7/8-5/12 11/12-11/18

1/5-1/6=6/30-5/30=1/30
3/4-1/3=9/12-4/12=5/12
7/9-2/11=77/99-18/99=59/99
3/4-4/9=27/36-16/36=11/36
7/8-5/12=21/24-10/24=11/24
11/12-11/18=33/36-22/36=11/36