把4kg的糖平均分成8袋,每袋是4kg的 ,每袋重 kg.
=28: =0.8= ÷10= %= .
=9: = ÷20== %
3:4= :12=12÷ == %
=75÷ =0.75= : = %= 折.
5:8= %;0.25的倒数是 .