\[\boxed{\mathbf{1078\ (1069)}\mathbf{.}\mathbf{\ }Еуроки\ - \ ДЗ\ без\ мороки}\]
\[1)\frac{1}{2} + \frac{1}{3} = \frac{5}{6}\]
\[2)\frac{1}{3} + \frac{1}{4} = \frac{7}{12}\]
\[3)\frac{1}{4} + \frac{1}{5} = \frac{9}{20}\]
\[4)\frac{1}{3} + \frac{1}{9} = \frac{4}{9}\]
\[5)\frac{1}{4} + \frac{1}{4} = \frac{1}{2}\]