一个数、百位、百分位和千分位上都是5,其它各位上都是0,这个数是 ,精确到十分位是 .
= :20=75%
÷5.6=2÷ ==28: ≈ %.
=15÷ == (填小数)
=0.375= : =6÷ = %.
=8:10=48÷ = (填小数)