Упростите выражение:

1. $$ \sqrt[28]{a^7} = a^{\frac{7}{28}} = a^{\frac{1}{4}} = \sqrt[4]{a} $$
2. $$ \sqrt[5]{b^3\sqrt[4]{b^3}} = \sqrt[5]{b^3 \cdot b^{\frac{3}{4}}} = \sqrt[5]{b^{\frac{12}{4}} \cdot b^{\frac{3}{4}}} = \sqrt[5]{b^{\frac{15}{4}}} = b^{\frac{15}{4} \cdot \frac{1}{5}} = b^{\frac{3}{4}} = \sqrt[4]{b^3} $$
3. $$ \sqrt[6]{m^6} = |m| $$
4. $$ \sqrt[10]{(x - 2)^{10}} = |x - 2| $$