решите уравнения 2 1/6+х= 5 1/2

2 4/15 - z= 1 2/5

x = 5 1/2 - 2 1/6

x = 5 3/6 - 2 1/6

x = 3 2/6 = 3 1/3

Ответ: 3 1/3

2)
z = 2 4/15 - 1 2/5

z = 2 4/15 - 1 6/15

z = 1 19/15 - 1 6/15

z = 13/15

Ответ: 13/15