Question

Спростіть вираз:
1) (x + 2) - (x - 3);
2) (y² + 2y - 3) + (y - y²);
3) (m² - 4m) + (2m - 9) - (2m + 7).​

Answer 1

Ответ:

(x + 2) - (x - 3) = x + 2 - x + 3 = (x - x) + (2 + 3) = 0 + 5 = 5.

(y² + 2y - 3) + (y - y²) = y² + 2y - 3 + y - y² = (y² - y²) + 2y + y - 3 = 0 + 3y - 3 = 3y - 3.

(m² - 4m) + (2m - 9) - (2m + 7) = m² - 4m + 2m - 9 - 2m - 7 = (m² - m²) + (-4m + 2m - 2m) + (-9 - 7) = 0 - 4m - 16 = -4m - 16.