一、化简整数比。 (1) 75 :50 = 3∶2 (2) 125 :55 = 25∶11 (3) 48 :42 = 8∶7 (4) 63 :81 = 7∶9 (5) 252 :189 = 4∶3 (6) 77 :121 = 7∶11 (7) 52 :65 = 4∶5 (8) 225 :350 = 9∶14 二、化简小数比。 (1) 0.8 :2.4 = 1∶3 (2) 1.25 :2.5 = 1∶2 (3) 5.6 :3.2 = 7∶4 (4) 1.7 :5.1 = 1∶5 (5) 0.36 :2.8 = 9∶70 (6) 0.36 :1.5 = 6∶25 (7) 4.5 :7.2 = 5∶8 (8) 2.18 :5.12 = 109∶256