化簡比15分:0.3秒8釐米:200米0.8:5.6

化簡比15分:0.3秒8釐米:200米0.8:5.6

15分:0.3秒
=900秒:0.3秒
=3000:1
8釐米:200米
= 8釐米:20000釐米
=1:2500
0.8:5.6
=8:56
=1:7