题目内容
求比值. (1)1
|
(2)
| ||||||
(3)1.4:
|
(4)1.25:6.5 | ||||||
(5)
|
(6)2
|
分析:求比值是根据比的意义(两个数相除又叫两个数的比),用比的前项除以后项即可;
千米:500米,先把单位统一,再用比的前项除以后项即可.
3 |
4 |
解答:解:(1)1
:
,
=1
÷
,
=
,
(2)
千米:500米,
=750米:500米,
=750÷500,
=1.5,
(3)1.4:
,
=1.4÷
,
=
,
(4)1.25:6.5,
=1.25÷6.5,
=
,
(5)
:0.75,
=
÷0.75,
=
,
(6)2
:
,
=2
÷
,
=7.
3 |
8 |
5 |
8 |
=1
3 |
8 |
5 |
8 |
=
11 |
5 |
(2)
3 |
4 |
=750米:500米,
=750÷500,
=1.5,
(3)1.4:
3 |
4 |
=1.4÷
3 |
4 |
=
28 |
15 |
(4)1.25:6.5,
=1.25÷6.5,
=
5 |
26 |
(5)
1 |
3 |
=
1 |
3 |
=
4 |
9 |
(6)2
1 |
3 |
1 |
3 |
=2
1 |
3 |
1 |
3 |
=7.
点评:求比值是用比的前项除以后项,小数化成分数进行计算,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;有单位的要注意单位的统一.
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