问题 解答题
化简比.
7
1
5
:0.24
12.6:0.4
1
20
4
5

1
3
小时:30分.
答案

(1)7

1
5
:0.24,

=

36
5
6
25

=

36
5
÷
6
25

=

36
5
×
25
6

=30:1;

(2)12.6:0.4,

=(12.6×10):(0.4×10),

=126:4,

=(126÷2):(4÷2),

=63:2;

(3)

1
20
4
5

=

1
20
÷
4
5

=

1
20
×
5
4

=

1
16

(4)

1
3
小时:30分

=20分:30分,

=20:30,

=(20÷10):(30÷10),

=2:3;

故答案为:30:1,63:2,

1
16
,2:3.

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