题目内容
| 8 |
| 48 |
| 9 |
| 8 |
| 1 |
| 8 |
| 2 |
| 7 |
考点：分数的加法和减法
专题：运算顺序及法则
分析：先去掉括号，然后根据加法的结合律计算．
解答：
解：
+
+（
+
）
=
+
+
+
=
+（
+
）+
=
+
+
=
+
+
=
+
=
| 8 |
| 48 |
| 9 |
| 8 |
| 1 |
| 8 |
| 2 |
| 7 |
=
| 8 |
| 48 |
| 9 |
| 8 |
| 1 |
| 8 |
| 2 |
| 7 |
=
| 8 |
| 48 |
| 9 |
| 8 |
| 1 |
| 8 |
| 2 |
| 7 |
=
| 8 |
| 48 |
| 5 |
| 4 |
| 2 |
| 7 |
=
| 8 |
| 48 |
| 60 |
| 48 |
| 2 |
| 7 |
=
| 17 |
| 12 |
| 2 |
| 7 |
=
| 143 |
| 84 |
点评：计算四则混合运算时，要按照运算顺序，先算乘除，后算加减，有括号的先算括号里面的，再算括号外面的．能简算的要简算．
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