题目内容
| 4 |
| 5 |
| 1 |
| 4 |
分析:先求出差,再求出和,求差是它们和的几分之几,用差÷和即可.
解答:解:(
-
)÷(
+
),
=
÷
,
=
.
| 4 |
| 5 |
| 1 |
| 4 |
| 4 |
| 5 |
| 1 |
| 4 |
=
| 11 |
| 20 |
| 21 |
| 20 |
=
| 11 |
| 21 |
点评:本题关键是找出单位“1”,然后找出先求出什么,再求出什么,再根据求一个数是另一个数几分之几求解.
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| 4 |
| 5 |
| 1 |
| 4 |
| 4 |
| 5 |
| 1 |
| 4 |
| 4 |
| 5 |
| 1 |
| 4 |
| 11 |
| 20 |
| 21 |
| 20 |
| 11 |
| 21 |