题目内容
求出下面各比的比值.
(1)0.75:8
(2)1
:
(3)0.4:
.
(1)0.75:8
(2)1
1 |
4 |
3 |
10 |
(3)0.4:
2 |
3 |
分析:用比的前项除以后项,再根据分数除法的计算方法求出比值.
解答:解:(1)0.75:8,
=0.75÷8,
=
×
,
=
;
(2)1
:
,
=
÷
,
=
×
,
=
;
0.4:
,
=
÷
,
=
×
,
=
.
=0.75÷8,
=
3 |
4 |
1 |
8 |
=
3 |
32 |
(2)1
1 |
4 |
3 |
10 |
=
5 |
4 |
3 |
10 |
=
5 |
4 |
10 |
3 |
=
25 |
6 |
0.4:
2 |
3 |
=
2 |
5 |
2 |
3 |
=
2 |
5 |
3 |
2 |
=
3 |
5 |
点评:此题主要考查了求比值的方法,另外还要注意求比值的结果是一个商,可以是整数,小数或分数.
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