5/24+9/56,23/25-11/15,15/16*8/9,8:5/8. 35 баллов
5/24+9/56= 35/168+27/168= 62/168 23/25-11/15= 69/75-55/75= 14/75 15/16*8/9= 15/18= 5/6 8:5/8= 64/5= 12,8