小数在求近似数时末尾的0可以去掉. .
4÷5=2÷ == 填小数.
6: ==0.6= ÷60= : = %
=15: =60%= ÷40= (填小数)
( )÷25==26÷( )=0.52=( )%
0.6= ÷20=6: ==.