题目内容
| 1 |
| 3 |
| 2 |
| 5 |
| 11 |
| 30 |
分析:通过观察,此题先通分,再计算.
解答:解:
+
-
,
=
+
-
,
=
.
| 1 |
| 3 |
| 2 |
| 5 |
| 11 |
| 30 |
=
| 10 |
| 30 |
| 12 |
| 30 |
| 11 |
| 30 |
=
| 11 |
| 30 |
点评:此题考查了异分母分数的加减法计算,先通分,再计算.
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