Сократите дробь: 1) (x-9) / (√x + 3); 2) (5+2√5) / √5; 3) (a-1) / (a - 2√a + 1)

1) (x-9) / (√x + 3) = ((√x)² - 3²) / (√x + 3) = (√x - 3)(√x + 3) / (√x + 3) = √x - 3 2) (5+2√5) / √5 = (5/√5) + (2√5/√5) = (√5*√5)/√5 + 2 = √5 + 2 3) (a-1) / (a - 2√a + 1) = ((√a)² - 1) / ((√a)² - 2√a + 1) = ((√a - 1)(√a + 1)) / (√a - 1)² = (√a + 1) / (√a - 1)