题目内容
求下面各比的比值.
| 14:21 |
|
6:
| ||||||||
| 2.5:0.5 | 184:92 | 20:0.5 | ||||||||
|
|
42:1.4. |
分析:根据求比值的方法,就用比的前项除以比的后项所得的商即为比值;据此进行计算.
解答:解:(1)14:21
=14÷21
=
;
(2)
:
=
÷
=
×
=6;
(3)6:
=6÷
=6×6
=36;
(4)2.5:0.5
=2.5÷0.5
=5;
(5)184:92
=184÷92
=2;
(6)20:0.5
=20÷0.5
=40;
(7)
:
=
÷
=
×6
=
;
(8)
:
=
÷
=
×
=
;
(9)42:1.4
=42÷1.4
=30.
=14÷21
=
| 2 |
| 3 |
(2)
| 9 |
| 11 |
| 3 |
| 22 |
=
| 9 |
| 11 |
| 3 |
| 22 |
=
| 9 |
| 11 |
| 22 |
| 3 |
=6;
(3)6:
| 1 |
| 6 |
=6÷
| 1 |
| 6 |
=6×6
=36;
(4)2.5:0.5
=2.5÷0.5
=5;
(5)184:92
=184÷92
=2;
(6)20:0.5
=20÷0.5
=40;
(7)
| 1 |
| 30 |
| 1 |
| 6 |
=
| 1 |
| 30 |
| 1 |
| 6 |
=
| 1 |
| 30 |
=
| 1 |
| 5 |
(8)
| 3 |
| 4 |
| 9 |
| 16 |
=
| 3 |
| 4 |
| 9 |
| 16 |
=
| 3 |
| 4 |
| 16 |
| 9 |
=
| 4 |
| 3 |
(9)42:1.4
=42÷1.4
=30.
点评:此题考查求比值的方法:比的前项除以比的后项所得的商;要注意区分:求比值的结果是一个数,可以是小数、分数和整数;而化简比的结果仍是一个比.
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