а) 1 - k = 6/10 + 1/10
k = 1 - 7/10
k = 3/10
б) t + 1 = 4/9 + 2/3
t = 4/9 + 6/9 - 9/9
t = 1/9
в) x + 2 3/8 = 5 1/4 - 1 3/8
x = 42/8 - 11/8 - 19/8
x = 12/8
x = 1 1/2
