Помогите пожалуйста сделать
Дам 45 баллов
Ответы на вопрос
1)
4 3/5 + 2 5/7 + 5 9/35 =
= (4 + 2 + 5) + (3/5 + 5/7 + 9/35) =
= 11 + (21/35 + 25/35 + 9/35) =
= 11 + 55/35 =
= 11 + 11/7 =
= 11 + 1 4/7 = 12 4/7,
2)
1 2/5 + 6 4/15 + 8 17/45 =
= (1 + 6 + 8) + (2/5 + 4/15 + 17/45) =
= 15 + (18/45 + 12/45 + 17/45) =
= 15 + 47/45 =
= 15 + 1 2/45 = 16 2/45,
3)
8 3/40 + 12 11/20 + 6 7/80 =
= (8 + 12 + 6) + (3/40 + 11/20 + 7/80) =
= 26 + (6/80 + 44/80 + 7/80) =
= 26 + 57/80 = 26 57/80,
4)
5 7/20 + 20 4/15 + 12 11/60 =
= (5 + 20 + 12) + (7/20 + 4/15 + 11/60) =
= 37 + (21/60 + 16/60 + 11/60)
= 37 + 48/60 =
= 37 + 4/5 = 37 4/5,
5)
5 2/5 + 19 9/10 + 4 33/50 =
= (5 + 19 + 4) + (2/5 + 9/10 + 33/50) =
= 28 + (20/50 + 45/50 + 33/50) =
= 28 + 98/50 =
= 28 + 49/25 =
= 28 + 1 24/25 = 29 24/25,
6)
31 7/9 + 4 11/27 + 35 43/54 =
= (31 + 4 + 35) + (7/9 + 11/27 + 43/54) =
= 70 + (42/54 + 22/54 + 43/54) =
= 70 + 107/54 =
= 70 + 1 53/54 = 71 53/54
Ответ:
решение на картинке
Пошаговое объяснение:
