做打勾题,做打勾题,
做打勾题,8题:D
8.5:6=15:189:8=18:16连起来是15:18:16选D三1.9:0.6=15:1=152.3/7:5/21=9/53.3/20:0.625=3/20:5/8=6:25=6/25若仍有疑问,欢迎追问!