А) 1 1/8 -6/8= 9/8-6/8=3/8
5 2/5-3/5=27/5-3/5=24/5 или 4 4/5
4 4/9-5/6=40/9-5/6= 40×2-5×3/18=80-15/18=65/18 или 3 11/18
б) 3 7/16 - 1 5/8= 55/16-13/8= 55-13×2/16=55-26/16= 29/16 или 1 13/16
6 2/15 - 3 2/3= 92/15-11/3= 92-55/15=37/15 или 2 7/15
12 5/8 - 5 11/12= 101/8 - 71/12= 101×3-71×2/24=
303-142/24= 161/24 или 6 17/24