Question

разложить на множители:
$2xy - 2y - {x}^{2} + 2x - 1$

Answer 1

2xy - 2y - x² + 2x - 1 = (2xy - 2y) - (x² - 2x + 1) = 2y(x - 1) - (x - 1)² =
= (x - 1)(2y - x + 1)