1) 56 - (x + 12) = 2456 - x - 12 = 2444 - x = 24-x = 24 - 44-x = -20x = 20
Проверка:56 - (20 + 12) = 56 - 32 = 24
2) 55 - (x - 15) = 3055 - x + 15 = 3070 - x = 30-x = 30 - 70-x = -40x = 40
Проверка:55 - (40 - 15) = 55 - 25 = 30
Ответ: x = 20 и x = 40.
1) 56 - (x + 12) = 24
56 - x - 12 = 24
44 - x = 24
-x = 24 - 44
-x = -20
x = 20
Проверка:
56 - (20 + 12) = 56 - 32 = 24
2) 55 - (x - 15) = 30
55 - x + 15 = 30
70 - x = 30
-x = 30 - 70
-x = -40
x = 40
Проверка:
55 - (40 - 15) = 55 - 25 = 30
Ответ: x = 20 и x = 40.