题目内容
| 求比值 1.5:2.5 |
2.8:
|
| ||||||||
|
|
0.65:1.8 | ||||||||
|
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:1.5:2.5,
=15÷25,
=3:5,
=
;
2.8:
,
=2.8×
,
=1.6;
:
,
=
÷
,
=
×4,
=
,
=3
;
:
,
=
÷
,
=
×
,
=
;
:
,
=
×
,
=2;
0.65:1.8,
=0.65÷1.8,
=
;
:3.75,
=
÷
,
=
×
,
=
=15÷25,
=3:5,
=
| 3 |
| 5 |
2.8:
| 7 |
| 4 |
=2.8×
| 4 |
| 7 |
=1.6;
| 4 |
| 5 |
| 1 |
| 4 |
=
| 4 |
| 5 |
| 1 |
| 4 |
=
| 4 |
| 5 |
=
| 16 |
| 5 |
=3
| 1 |
| 5 |
| 9 |
| 5 |
| 27 |
| 10 |
=
| 9 |
| 5 |
| 27 |
| 10 |
=
| 9 |
| 5 |
| 10 |
| 27 |
=
| 2 |
| 3 |
| 7 |
| 2 |
| 7 |
| 4 |
=
| 7 |
| 2 |
| 4 |
| 7 |
=2;
0.65:1.8,
=0.65÷1.8,
=
| 13 |
| 36 |
| 3 |
| 8 |
=
| 3 |
| 8 |
| 15 |
| 4 |
=
| 3 |
| 8 |
| 4 |
| 15 |
=
| 1 |
| 10 |
点评:点评:此题考查求比值的方法,要注意区分:化简比的结果是一个比,它的前项和后项都是整数,并且是互质数;而求比值的结果是一个数,可以是整数、小数或分数.
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