129. Simplify the fraction $\frac{x^{3 / 4}-25 x^{1 / 4}}{x^{1 / 2}+5 x^{1 / 4}}$.
Solution. By factoring the numerator and denominator of the fraction and simplifying it, we get

$$
\frac{x^{3 / 4}-25 x^{1 / 4}}{x^{1 / 2}+5 x^{1 / 4}}=\frac{x^{1 / 4}\left(x^{1 / 2}-25\right)}{x^{1 / 4}\left(x^{1 / 4}+5\right)}=\frac{\left(x^{1 / 4}-5\right)\left(x^{1 / 4}+5\right)}{\left(x^{1 / 4}+5\right)}=x^{1 / 4}-5
$$

130-136. Simplify the expressions: