4:0.5= 1/6:1/9= 8.1:0.9= 15:0.5= 0.75:1.5= 8/15:4/5= 5/14:2/5= 3:一又1/5=
1:一又1/4= 2又1/4:9=
ps:只要比值.
“/”这是除号.