Решите уравнение и выполните проверку:
a) (x + 15) - 8 = 17;
б) (24 + x) - 21 = 10;
в) (45 - y) + 18 = 58;
г) (y - 35) + 12 = 32;
д) 56 - (x + 12) = 24;
е) 55 - (x - 15) = 30.

Спасибо!

Спасибо!

Очень выручила! Огромное спасибо!

а) (x + 15) - 8 = 17;x + 15 = 17 + 8.x + 15 = 25.x = 25 - 15.x = 10.---------------------------(10 + 15) - 8 = 17.25 - 8 = 17.17 = 17.б) (24 + x) - 21 = 10;24 + x = 10 + 21.24 + x = 31.x = 31 - 24.x = 7.----------------------------(24 + 7) - 21 = 10.31 - 21 = 10.10 = 10.в) (45 - y) + 18 = 58;45 - y = 58 - 18.45 - y = 40.y = 45 - 40.y = 5.------------------------------(45 - 5) + 18 = 58.40 + 18 = 58.58 = 58.г) (y - 35) + 12 = 32;y - 35 = 32 - 12.y - 35 = 20.y = 35 + 20.y = 55.----------------------------(55 - 35) + 12 = 32.20 + 12 = 32.32 = 32.д) 56 - (x + 12) = 24;x + 12 = 56 - 24.x + 12 = 32.x = 32 - 12.x = 20.------------------------------56 - (20 + 12) = 24.56 - 32 = 24.24 = 24.е) 55 - (x - 15) = 30.x - 15 = 55 - 30.x - 15 = 25.x = 25 + 15.x = 40.-------------------------------55 - (40 - 15) = 30.55 - 25 = 30.30 = 30.

a) (x + 15) - 8 = 17 => x + 7 = 17 => x = 17 - 7 = 10. Проверка: (10 + 15) - 8 = 25 - 8 = 17.б) (24 + x) - 21 = 10 => x + 3 = 10 => x = 10 - 3 = 7. Проверка: (24 + 7) - 21 = 31 - 21 = 10;в) (45 - у) + 18 = 58 => 63 - у = 58 => у = 63 - 58 = 5. Проверка: (45 - 5) + 18 = 40 + 18 = 58.г) (у - 35) + 12 = 32 => у - 23 = 32 => у = 23 + 32 => у = 55. Проверка: (55 - 35) + 12 = 20 + 12 = 32.д) 56 - (х + 12) = 24 => 44 - x = 24 => х = 44 - 24 = 20. Проверка: 56 - (20 + 12) = 56 - 32 = 24.е) 55 - (х - 15) = 30 => х - 15 = 55 - 30 => х = 25 + 15 = 40. Проверка: 55 - (40 - 15) - 55 - 25 = 30.