Question

Ребят , помогите пожалуйста ❤
СРОЧНО

Answer 1

4)

$( sqrt{17} - sqrt{7} ) times ( sqrt{17} + sqrt{17} ) = \ = 17 times - 7 = 10$

5)

${x}^{2} - 8x - 20 = 0 \ d = ( - 8) ^{2} - 4 times1 times ( - 20) = 64 + 80 = 144 = {12}^{2} \ x1 = frac{8 + 12}{2} = frac{20}{2} = 10 \ x2 = frac{8 - 12}{2} = frac{ - 4}{2} = - 2$

6)

$frac{ {a}^{2}b - 4b^{3} }{3ab^{2} } times frac{ {a}^{2}b }{ {a}^{2} - 2ab } = frac{b times ( {a}^{2} - 4 {b}^{2})}{3b} times frac{a}{a times (a - 2b)} = \ = frac{(a - 2b) times (a + 2b)}{3} times frac{a}{a times (a - 2b)} = \ = frac{a + 2b}{3}$

Answer 2

спасибо большое

Answer 3

на здоровье!