题目内容
求比值: 3.5:
|
| ||||||
0.8:
|
5厘米:20千米 | ||||||
3
|
4.6:9
| ||||||
1.25:6.5 |
分析:根据求比值的方法,就用比的前项除以后项即得比值.
解答:解:3.5:
=3.5÷
=4.9;
:
=
÷
=
;
0.8:
=0.8÷
=80;
5厘米:20千米
=5厘米:2000000厘米
=5÷2000000
=
;
3
:0.75
=
÷
=
;
4.6:9
=4.6÷
=0.5;
1.25:6.5
=1.25÷6.5
=
;
米:12分米
=2分米:12分米
=2÷12
=
.
5 |
7 |
=3.5÷
5 |
7 |
=4.9;
3 |
4 |
2 |
5 |
=
3 |
4 |
2 |
5 |
=
15 |
8 |
0.8:
1 |
100 |
=0.8÷
1 |
100 |
=80;
5厘米:20千米
=5厘米:2000000厘米
=5÷2000000
=
1 |
400000 |
3
9 |
20 |
=
69 |
20 |
3 |
4 |
=
23 |
5 |
4.6:9
1 |
5 |
=4.6÷
46 |
5 |
=0.5;
1.25:6.5
=1.25÷6.5
=
5 |
26 |
1 |
5 |
=2分米:12分米
=2÷12
=
1 |
6 |
点评:此题考查求比值的方法,要注意区分:求比值的结果是一个数,而化简比的结果是一个比;还要注意:如果比的前后项是名数时,要把单位化统一后再求比值.
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