题目内容
直接写出得数.
-
+
-
+
.
| 7 |
| 8 |
| 1 |
| 8 |
| 1 |
| 9 |
| 8 |
| 9 |
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 7 |
| 6 |
| 7 |
分析:同分母分数相加减,分母不变,分子相加减;异分母分数相加减,先通分,变成同分母分数再相加减.
解答:解:
-
=
,
+
=1,
-
=
,
+
=
.
故答案为:
,1,
,
.
| 7 |
| 8 |
| 1 |
| 8 |
| 3 |
| 4 |
| 1 |
| 9 |
| 8 |
| 9 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
| 2 |
| 7 |
| 6 |
| 7 |
| 8 |
| 7 |
故答案为:
| 3 |
| 4 |
| 1 |
| 6 |
| 8 |
| 7 |
点评:本题考查了基本的分数加减法,按照运算法则直接求解,注意把结果化成最简分数.
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