1、0.25=25/100,0.3=3/10,0.4=4/10
2、2/5,3/10,3/4,1/4,1/8,3/8,1/5
3、0.5,0.2,0.125,0.75,0.375,0.16,0.04
4、=;>;<;>;=;<;>;<
6、(1)1/5,1/2,0.4,0.7,0.95
(2)1.5,1/2,4/5,0.4,0.65,1.2
7、略
8、2,3,9