Question

При каких значениях n дробь  n-1 равна 10

                                                9            18

Answer 1

(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.