把5克糖溶化在45克水中,这杯糖水的含糖率是 %,糖与水的最简整数比是 .
12÷ == ÷45.
9: ==3÷5.
3÷4==27: = (填小数)= %.
÷4==0.25= :8.
=9÷ = :8== (填小数)