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①0.2:0.8             ②2:0.25
1
2
5
6
             ④4:
1
3
分析:求比值是根据比的意义,用比的前项除以比的后项,就可以求出比值.
解答:解:①0.2:0.8=
2
10
8
10
=
2
10
÷
8
10
=
2
10
×
10
8
=
1
4

②2:0.25=2:
25
100
=2:
1
4
=2÷
1
4
=2×4=8;
1
2
5
6
=
1
2
÷
5
6
=
1
2
×
6
5
=
3
5

④4:
1
3
=4÷
1
3
=4×3=12.
点评:求比值是用比的前项除以后项,小数化成分数进行计算,结果最好用分数表示.
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