1. Сократи дроби.

1) 2/4 = 1/2, 3/9 = 1/3; 2) 10/15 = 2/3, 12/16 = 3/4; 3) 25/45 = 5/9, 28/77 = 4/11; 4) 36/81 = 4/9, 35/95 = 7/19; 5) 51/170 = 3/10, 72/342 = 4/19; 6) 348/924 = 2/5, 132/286 = 6/13; 7) 525/700 = 3/4, 864/2592 = 1/3.