x=
①1: =x:1.4
②
③0.3: = :x
④x:18.4=5:4
⑤x:9.6=3:2
⑥ :x=1:25
① 千米:500米(求比值)
② (化简比)
③12.6:0.4(化简比)
④ =
⑤2.8:4=0.7:x
⑥x:21=5:63
①15:x=1.8:5.4
②x: =20:5
③
④
⑤0.8:4=x:8.5
⑥