题目内容
直接写出得数.
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分析:第(1)(2)(3)(4)(7)(8)题属于异分母分数的加减法,先通分,再计算;
第(5)(6)题属于同分母分数的加减法,只把分子相加减,分母不变.
第(5)(6)题属于同分母分数的加减法,只把分子相加减,分母不变.
解答:解:
+
=
;
+
=
;
-
=
;
+
=
;
+
=
;
-
=
;
-
=
;
+
=
.
| 1 |
| 4 |
| 1 |
| 3 |
| 7 |
| 12 |
| 3 |
| 5 |
| 7 |
| 10 |
| 13 |
| 10 |
| 7 |
| 9 |
| 1 |
| 3 |
| 4 |
| 9 |
| 1 |
| 3 |
| 1 |
| 5 |
| 8 |
| 15 |
| 1 |
| 5 |
| 1 |
| 5 |
| 2 |
| 5 |
| 7 |
| 8 |
| 5 |
| 8 |
| 1 |
| 4 |
| 1 |
| 10 |
| 1 |
| 20 |
| 1 |
| 20 |
| 5 |
| 14 |
| 7 |
| 42 |
| 11 |
| 21 |
点评:同分母分数相加减,只把分子相加减,分母不变;异分母分数相加减,先通分,再计算.
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