а) 4х²у²-9а²= (2xy - 3a)(2xy + 3a)
б)25а²-(а+3)² = (5a - a - 3)(5a + a + 3) = (4a - 3)(6a + 3)
a² - b² = (a - b)(a + b)
а) 4х²у²-9а²= (2xy - 3a)(2xy + 3a)
б)25а²-(а+3)² = (5a - a - 3)(5a + a + 3) = (4a - 3)(6a + 3)
a² - b² = (a - b)(a + b)