20 быстрее просто ответы 3-2/11= 4-3 4/9= 7 3/8= 45-44 3/8= 6 7/15-3 1/5

3-2/11= 2 9/11
4-3 4/9= 3 9/9 - 2 4/9 = 1 5/9 
7 3/8 - 5 = 19/8 = 2 3/8
45-44 3/8= 44 8/8 - 44 3/8 = 5/8
6 7/15-3 1/5 = 6 7/15 - 3 3/15 = 3 4/15