题目内容
计算：| 1 |
| 2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 4×5 |
分析：分式可化为：
+(
-
)+(
-
)+(
-
)，中间数互相抵消，首尾数相加即可得出结果．
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
解答：解：根据分式的运算法则：原式=
+
•
+
•
+
•
=
+(
-
)+(
-
)+(
-
)=
．
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 5 |
| 4 |
| 5 |
点评：本题考查了分数的加减运算．
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