2)
(10 + 2√10) / √10 = √10*(√10 + 2) / √10 = √10 + 2,
3)
(х - 18√х + 81) / (х - 81) = (√х - 9) / (√х - 9)(√х + 9) = 1 / (√х + 9),
6 / (√11 - 3) = 6(√11 + 3) / (√11 - 3)(√11 + 3) =
= 6(√11 + 3) / (11 - 9) = 6(√11 + 3) / 2 = 3*(√11 + 3),
1)
√125х¹² = √(25*5*(х⁶)²) = 5х⁶√5,
2)
√(а⁷*(в¹¹)² = в¹¹*√а⁷,
2)
(√24 - √6) * √6 = √(24*6) - √6*√6 = √(4*6*6) - 6 =
= 2*6 - 6 = 12 - 6 = 6,
3)
(√6 - 1)² = (√6)² - 2*1*√6 + 1² = 6 - 2√6 + 1 = 7 - 2√6