(2 61/80-9 49/60)+(-12 81/120) 60 баллов

(2 61/80-9 49/60)+(-12 81/120)=(221/80 - 589/60) + ( -1440/120)=(663/240 - 2356/240) + (-1440/120)= - 1693/240 - 2880/240= - 4573/240=-19 13/240