化简比并求比值. 125:75 1.6:2.4 1

化简比并求比值. 125:75 1.6:2.4 1 20 :1 1 4 0.5: 5 12 .

(1)125:75,
=(125÷25):(75÷25),
=5:3;

125:75,
=125÷75,
=
5
3


(2)1.6:2.4,
=(1.6÷0.8):(2.4÷0.8),
=2:3;

1.6:2.4,
=1.6÷2.4,
=
2
3


(3)
1
20
:1
1
4

=
1
20
5
4

=(
1
20
×20):(
5
4
×20),
=1:25;

1
20
:1
1
4

=
1
20
÷
5
4

=
1
20
×
4
5

=
1
25


(4)0.5:
5
12

=
1
2
5
12

=(
1
2
×12):(
5
12
×12),
=6:5;

0.5:
5
12

=
1
2
÷
5
12

=
1
2
×
12
5

=
6
5
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