А) 9/14- 3/7+ 15/27= 9/14-6/14+15/28= 18/28-12/28+15/28= 21/28
б) 7/12-5/6+13/24=7/12-10/12+13/24= 14/24 - 20/24 + 13/24= 16/24=8/18=4/9
в) 13/18 - 29/45+8/15= 65/90-58/90+48/90=7/90+48/90= 55/90=11/18
г)9/16+7/24-3/8= 9/16+ 7/24- 6/16= 27/48+ 14/48-18/48=23/48
д) 2/5+ 4/15-5/9= 6/15+4/15-5/9= 18/45+12/45-25/45= 5/45= 1/9
е) 37/42-17/24+5/7=72/84-51/84+60/84=21/84+60/84=81/84=27/28