Проверка:300 : (5*5 + 5) = 10300 : (25 + 5) = 10300 : 30 = 1010 = 10
Проверка:(99 + 1) : 10 = 600 : 60100 : 10 = 1010 = 10
Ответ: x = 5 и x = 1.
300 = 10(5x + 5)
300 = 50x + 50
250 = 50x
x = 5
Проверка:
(99 + x) : 10 = 600 : 60300 : (5*5 + 5) = 10
300 : (25 + 5) = 10
300 : 30 = 10
10 = 10
(99 + x) : 10 = 10
99 + x = 100
x = 1
Проверка:
(99 + 1) : 10 = 600 : 60
100 : 10 = 10
10 = 10
Ответ: x = 5 и x = 1.