0.3:12/5方法一:0.3:12/5=0.3:2.4=3:24=1:8方法二:0.3:12/5=3/10:12/5=3/10×5/12=1/8=1:8
答:依题意得0.3:12/5=3/10÷12/5=3/10×5/12=1/8。