10枝铅笔平均分给5个同学.每枝铅笔是铅笔总数的,每人分得的铅笔是铅笔总数的.
0.12=== ÷ =24: .
:5=== ÷25= (写小数).
12÷ ==0.375= :64= ÷24.
=== ÷ = (小数)
== :20= ÷ .