1. 42:0.3=x:0.45 35:0.8=x:18 14:x=21:4 x:3.5=1.4:5.6 9:36=12:x x:4.5=4:27 1.875:2.5=x:1.2 15:x=36:48 0.1:x=0.125:0.375 9:x=0.1:8.1 45:x=1.5:2 10:x=16:0.6 7:x=4.5:9 0.75:x=0.125;20.5 x:1.4=4.2:1.2 如有加分我会写下去.