Вопрос:

1. 2x - 1 = 45.

Фотография

Ответ ассистента

1. 2x - 1 = 45 -> 2x = 46 -> x = 23. 2. 3x - 7 = x - 17 -> 2x = -10 -> x = -5. 3. (x - 3) / 4 = x / 5 -> 5(x - 3) = 4x -> 5x - 15 = 4x -> x = 15. 4. 12 - 3x - 2x = -3 -> 12 - 5x = -3 -> -5x = -15 -> x = 3. 5. (x - 1) / 2 + (3x + 2) / 5 = 12 -> умножим на 10: 5(x - 1) + 2(3x + 2) = 120 -> 5x - 5 + 6x + 4 = 120 -> 11x - 1 = 120 -> 11x = 121 -> x = 11. 6. 7 + 2x = 45 -> 2x = 38 -> x = 19. 7. 2x + 1 = -3x + 36 -> 5x = 35 -> x = 7. 8. -2x + 18 = -x - 9 -> -x = -27 -> x = 27. 9. (5x + 3) / 2 - (10 + x) / 3 + 4 = 0 -> умножим на 6: 3(5x + 3) - 2(10 + x) + 24 = 0 -> 15x + 9 - 20 - 2x + 24 = 0 -> 13x + 13 = 0 -> 13x = -13 -> x = -1.

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