Номер 421 6 класс велекин, жохов

а) 1 - k = 3/5 + 1/10

1 - k = 6/10 + 1/10

1 - k = 7/10

k = 1  - 7/10 = 10/10 - 7/10

k = 3/10

1 - 3/10 = 3/5 + 1/10

б) t + 1 = 4/9 + 2/3

t + 1 = 4/9 + 6/9

t + 1 = 10/9

t = 10/9 - 1 = 10/9 - 9/9

t = 1/9

1/9 + 1 = 4/9 + 2/3

в) x + 2 3/8 = 5 1/4 - 1 3/8

x + 2 3/8 = 5 2/8 - 1 3/8 = 4 10/8 - 1 3/8

x + 2 3/8 = 3 7/8

x = 3 7/8 - 2 3/8

x = 1 4/8

1 4/8 + 2 3/8 = 5 1/4 - 1 3/8

Пошаговое объяснение:

1 - k= 3/5+ 1/10

k= 3/5+1/10+1/1