Решение
1) (a + 3)/(a - 1) + (a + 5)/(2 - 2a) = (a + 3)/(a - 1) - (a + 5)/[2*(a - 1)] =
(2a + 6 - a - 5) / [2*(a - 1)] = (a + 1) / [2*(a - 1)]
2) (2x - y) /(2x + y) + y/(4x + 2y) = (2x - y) /(2x + y) + y / ]2*(2x + y)] =
(4x - 2y + y) / ]2*(2x + y)] = = (4x - y) / ]2*(2x + y)]