(n-1)/9 = 10/18
n-1 = 10/18*9/1
n-1 = 10/2
n-1 = 5
n = 5+1
n = 6
Проверяем:
(6-1)/9 = 10/18
5/9 = 10/18
ответ: n = 6.
(n-1)/9 = 10/18
n-1 = 10/18*9/1
n-1 = 10/2
n-1 = 5
n = 5+1
n = 6
Проверяем:
(6-1)/9 = 10/18
5/9 = 10/18
ответ: n = 6.