因为0.9=0.90,所以近似数0.90可以写成0.9.﹣﹣﹣﹣﹣﹣﹣ . (判断对错)
:35=18÷ ==O.4= %
=12÷ == :24= %
6÷ ==37.5%=12: =.
=12÷ =0.25=4: = %
1÷4==4: = %= (小数)