Question

Решите пожалуйста срочно​

Answer 1

$(x + 9) \div \frac{ {x}^{2} + 18x + 81 }{x - 9} = \\ = \frac{ (x-9)(x+9) }{{x}^{2} + 18x + 81} = \\ = \frac{(x - 9)(x + 9)}{ {(x + 9)}^{2} } = \\ = \frac{x - 9}{x + 9}$

Делаем замену

$\frac{81 - 9}{81 + 9} = \frac{72}{100} = 0.72$

Answer 2

Ответ:

( x+9)÷x²+18x+81/x-9 = (x+9)÷x² +18 +9 /x-1 = (x+9)÷x +18 +9/-1 =(x +9)÷-x -8-9 = x+9÷(-x)-8-9 = 9x÷(-x) -8-9 = 9x÷(-x)-17=9x ÷ -17x;