在横线上填上适当的数。4.7×8.6+8.6× ______ =8612.5×0.72×0.76=12.5×0.8× ______ ×0.76
=l8: = :20== ÷40= (填小数)
3:8=18÷ ═ %= .小数.
÷8===15÷ = ÷32= (填小数)
0.3==12÷ = :30= %
÷40=20: =0.8= : .