\[\boxed{\text{3\ (3).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\frac{2m - n}{3m + 2n}\text{\ \ }\]
\[если\ m = - 1;\ \ n = 1:\]
\[\frac{2m - n}{3m + 2n} = \frac{2 \cdot ( - 1) - 1}{3 \cdot ( - 1) + 2 \cdot 1} =\]
\[= \frac{- 2 - 1}{- 3 + 2} = \frac{- 3}{- 1} = 3.\]
\[2)\ \frac{2m - n}{3m + 2n}\text{\ \ }\]
\[если\ m = 4;\ \ n = - 5:\]
\[\frac{2m - n}{3m + 2n} = \frac{2 \cdot 4 - ( - 5)}{3 \cdot 4 + 2 \cdot ( - 5)} =\]
\[= \frac{8 + 5}{12 - 10} = \frac{13}{2} = 6,5.\]