问题 解答题
先化简比再求比值:
(1)42:28
(2)0.5:0.15
(3)
7
8
5
6

(4)
2
3
小时:40分.
答案

(1)42:28,

=(42÷14):(28÷14),

=3:2;

42:28,

=3:2,

=3÷2,

=

3
2

(2)0.5:0.15,

=(0.5×20):(0.15×20),

=10:3;

0.5:0.15,

=10:3,

=10÷3,

=

10
3

(3)

7
8
5
6

=(

7
8
×24):(
5
6
×24),

=21:20;

7
8
5
6

=21:20,

=21÷20,

=

21
20

(4)

2
3
小时:40分,

=40分:40分,

=1:1;

2
3
小时:40分,

=1:1,

=1÷1,

=1.

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