(5 11/12 +8 7/15) + (16 7/24 - 9 3/56) Сделайте пж

(5 11/12 +8 7/15) + (16 7/24 - 9 3/56) = 21 87/1401) 5 11/12 + 8 7/15 = 5 55/60 + 8 28/60 = 13 83/60 = 14 23/602) 16 7/24 - 9 3/56 = 16 49/168 - 9 9/56 = 7 40/168 3) 14 23/60 + 7 40/168 = 14 322/840 + 7 200/840 = 21 522/840 = 21 87/140