1) разность квадратов:
(x² + 2x - 1)*(x² + 2x + 1) = (x² + 2x - 1)(x+1)²
2) (2y - y + c)(2y + y - c) = (y + c)(3y - c)
3) (3a + 1)² - 4b² = (3a + 1 - 2b)(3a + 1 - 2b)
4) 25a² - (2b - 1)² = (5a - 2b + 1)(5a + 2b - 1)
5) (b - a)(b - a - 1)
6) (x-1)(2b - 3a + c)
7) 8a(x + 2y) - 3b(x + 2y) = (x + 2y)(8a - 3b)
8) a² - (x-2)² = (a - x + 2)(a + x - 2)
9) a(4-a²) = a(2-a)(2+a)
10) a²(36a² - 25b²) = a²(6a - 5b)(6a + 5b)