а)4 3/8-(3 5/7-1 5/7)+1 5/8б)12 7/12-4 5/12-(20 3/4-19 3/4) Помогите плиз))

а) 4 3/8 - (3 5/7 - 1 5/7) + 1 5/8 = (4 3/8 + 1 5/8) - (3 5/7 - 1 5/7) = 5 8/8 - 2 = 6 - 2 = 4б) 12 7/12 - 4 5/12 - (20 3/4 - 19 3/4) = 8 2/12 - 1 = 7 1/6Пояснения:2/12 = 1/6 - сократили на 2