0.9米= 厘米; 6吨40千克= 千克;850克= 千克;5.1分米= 分米 厘米.
:4=0.75=9: =.
=3÷ =0.5= :10= %
=9÷ = :16= %= 填小数.
.
÷30=2÷5=18: = %