$\frac {1} {2}$:$\frac {1} {4}$=:(化简比)
0.48:0.8=:(化简比)
1:0.25=:(化简比)
1.2:0.12=:(化简比)
2.7:5.4=:(化简比)
6.4:8=:(化简比)
0.5:0.6=:(化简比)
0.12:6=:(化简比)