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①0.2:0.8 ②2:0.25③12:56 ④4:13.

编辑:chaxungu时间:2026-04-27 14:12:14分类:小学数学题库

①0.2:0.8②2:0.25
1
2
5
6
④4:
1
3
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.