题目内容
| 5 |
| 9 |
| 1 |
| 6 |
| 5 |
| 8 |
| 1 |
| 3 |
| 1 |
| 4 |
| 2 |
| 5 |
| 3 |
| 8 |
| 5 |
| 12 |
| 3 |
| 8 |
| 5 |
| 6 |
| 1 |
| 4 |
1-
| 2 |
| 17 |
| 1 |
| 2 |
分析：异分母分数相加减，先通分，化成同分母的分数再相加减；
+
+
运用加法交换律简算．
| 1 |
| 4 |
| 2 |
| 5 |
| 3 |
| 8 |
解答：解：
+
=
，
+
=
，
+
+
=
，
+
=
，
-
=
，
1-
-
=
．
| 5 |
| 9 |
| 1 |
| 6 |
| 13 |
| 18 |
| 5 |
| 8 |
| 1 |
| 3 |
| 23 |
| 24 |
| 1 |
| 4 |
| 2 |
| 5 |
| 3 |
| 8 |
| 41 |
| 40 |
| 5 |
| 12 |
| 3 |
| 8 |
| 19 |
| 24 |
| 5 |
| 6 |
| 1 |
| 4 |
| 7 |
| 12 |
1-
| 2 |
| 17 |
| 1 |
| 2 |
| 13 |
| 35 |
点评：口算题目要求快速准确，能运用简算方法的要简算．
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