1)  (12 5/22+7 17/22) - (13 7/23-9 15/23)
2)  29 49/53 - 8 49/53
3)  (20 16/25+13 9/25) - (23 4/14+7 13/14)

1) (12 5/22+7 17/22)-(13 7/23 - 9 15/23)=16 8/2312 5/22 +7 17/22= 269/22+171/22=440/22=2013 7/23 - 9 15/23 =306/23 - 222/23=84/23=3 15/2320- 3 15/23= 20/1 - 84/23=(460-84)/23=376/23=16 8/232)29 49/53 - 8 49/53=1586/53 -473/53 =1113/53=213) (20 16/25+13 9/25)-(23 4/14 +7 13/14)=2 11/1420 16/25+13 9/25=516/25 +334/25=850/25=3423 4/14 + 7 13/14=(326+111)/14=437/14=31 3/1434- 31 3/14=39/14=2 11/14