问题 解答题
化简比.
1.25:4.57:
7
8
7
15
1
7
5
3
8
1
3
答案

(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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单项选择题