题目内容

(1)6:12
(2)0.2:0.05
(3)
9
20
9
2

(4)21:42
(5)
3
4
9
16

(6)
24
25
48
50
(1)6:12=(6÷6):(12÷6)=1:2,
比值是:1:2=1÷2=
1
2

(2)0.2:0.05=(0.2×100):(0.05×100),
=20:5;
=(20÷5):(5÷5),
=4:1,
比值是:4:1=4÷1=4;
(3)
9
20
9
2
=
9
20
÷
9
2
=
9
20
×
2
9
=
1
10
=1:10,
比值是:
1
10

(4)21:42=(21÷21):(42÷21)=1:2,
比值是:1:2=
1
2

(5)
3
4
9
16
=
3
4
÷
9
16
=
3
4
×
16
9
=
4
3

比值是:
4
3

(6)
24
25
48
50
=
24
25
÷
48
50
=
24
25
×
50
48
=1:1,
比值是:1.
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