计算小数加减法时,应先把 对齐,得数的末尾有0,一般要把0 .
36÷ ==0.4=4: = %
:20==80%=20÷ = (填小数)
==12÷ = (填小数)
=0.75=( )÷8( )%=24:( )
= :0.8=0.75= ÷12= %.