Вычислите а)4 11/15 + 2 7/20 = б)5 2/7 - 4 11/14​

А) 4 11/25 + 2 7/20 = 111/25 + 47/20 = (111×4 + 47×5)/60 = (444+235)/60 = 679/60 = 11 19/60 = 11,31(6)

Б) 5 2/7 - 4 11/14 = 37/7 - 67/14 = (37×2 + 67)/14 = (74+67)/14 = 141/14 = 10 1/14 =