2) m^2n^3 = 1/2 · n^2

\( m^2 n^3 = \frac{1}{2} n^2 \)
\( m^2 = \frac{1}{2} \cdot \frac{n^2}{n^3} \)
\( m^2 = \frac{1}{2n} \)
\( m = \pm \sqrt{\frac{1}{2n}} \)

Ответ: \( m = \pm \sqrt{\frac{1}{2n}} \)