试题:
化简比.
1.25:4.57:
7
8
7
15
1
7
5
3
8
1
3
比的化简 2016-05-21

答案:

我来补答
(1)1.25:4.5,
=(1.25×100):(4.5×100),
=125:450,
=(125÷25):(450÷25),
=5:18;

(2)7:
7
8

=(7×8):(
7
8
×8
),
=56:7,
=(56÷7):(7÷7),
=8:1;

(3)
7
15
:1
7
5

=(
7
15
×15):(
12
5
×15),
=7:36;

(4)
3
8
1
3

=(
3
8
×24
):(
1
3
×24),
=9:8.
 
 
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