Simplify the following: (1) \( \frac{x-1}{x^{2}+3 x+2} \div\left[\frac{x-3}{x+1}-\frac{x-4}{x+2}\right] \) (2) \( \frac{\frac{6 x+5}{x-5}-1}{\frac{3 x+20}{x-5}+2} \) (3) \( \frac{a^{2}+\left(1-a^{2}\right)}{(1+a) a} \times \frac{(1+a) a}{a^{2}-\left(1-a^{2}\right)} \)

Which expression is equivalent to \( 32 \sqrt[3]{18 y} \div 8 \sqrt[3]{3 y} \), if \( y \neq 0 \) ? A. \( 12 \sqrt[3]{2 y^{2}} \) B. \( 4 \sqrt[3]{6} \) C. \( 4 \sqrt[3]{15 y} \) D. \( 4 \sqrt[3]{6 y} \)

Write the expression in exponent form.

Реши неравенство: \( x^{2}-25 x>0 \). Промежутки перечисли через точку с вапятой.)

What is the approximate solution to this equation? \( 4 \ln x-8=12 \) A. \( x \approx 59,874 \) B. \( x \approx 10.5 \) C. \( x \approx 1.61 \) D. \( x \approx 148.4 \)

\[ 7+8+21+33+?=\text { an average of } 17 \] What number should replace the question mark?