375. Сократить дроби.

1) 10/20 = 1/2, 21/28 = 3/4, 14/35 = 2/5, 42/63 = 2/3, 40/90 = 4/9, 36/48 = 3/4, 126/160 = 63/80, 924/1260 = 22/30, 680/1700 = 34/85; 2) 9/15 = 3/5, 25/35 = 5/7, 18/81 = 2/9, 44/33 = 4/3, 72/120 = 3/5, 120/180 = 2/3, 768/1500 = 128/250, 1500/99000 = 1/66, 6300/4500 = 7/5.