题目内容
直接写得数
-
=
+
=
-
=
+
-
+
=
| 1 |
| 3 |
| 2 |
| 9 |
| 1 |
| 8 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
考点：分数的加法和减法
专题：计算题
分析：①②③通分计算；④运用加法交换律与结合律简算．
解答：
解：
-
=
+
=
-
=
+
-
+
=1
| 1 |
| 3 |
| 2 |
| 9 |
| 1 |
| 9 |
| 1 |
| 8 |
| 1 |
| 4 |
| 3 |
| 8 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 12 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
点评：此题考查了异分母分数的加减法计算，注意通分以及简算．
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