题目内容
从1里面减去
,再减去
,得
.
| 1 |
| 5 |
| 3 |
| 4 |
| 1 |
| 20 |
| 1 |
| 20 |
分析:用1减去
,再减去
,列式计算即可.
| 1 |
| 5 |
| 3 |
| 4 |
解答:解:1-
-
,
=
-
,
=
-
,
=
.
故答案为:
.
| 1 |
| 5 |
| 3 |
| 4 |
=
| 4 |
| 5 |
| 3 |
| 4 |
=
| 16 |
| 20 |
| 15 |
| 20 |
=
| 1 |
| 20 |
故答案为:
| 1 |
| 20 |
点评:此题考查了分数的减法,要注意通分.
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