把0.007扩大到它的100倍是 ,把8.6缩小为原数的 是0.0086.
= ÷5=0.8=4: = %= 折.
÷8=0.25= %= :16.
==8÷ == (小数).
÷4==15÷ = = 折.
3÷8== (填小数)