用“四舍五入”法取近似值,约等于0.70的三位小数中最大的是0.699. .
=4÷5=32: = %= 折.
=10÷ = ÷0.3=.
==12÷ =≈ (保留两位小数).
12÷ == %= 折=0.6.
= :15=15÷ = %=0.6.