8只鸡放进3个鸡笼,至少有 只鸡要放进同一个鸡笼里.
4÷5==== ÷80.
6÷ ===≈ .(保留三位小数)
=0.375=12÷ = : .
= %=8÷ =4: = (填小数)
0.875=== ÷56=35÷ .