题目内容
从和式
+
+
+
+
+
+
中去掉两个分数,使余下的数的和为1,则去掉的两个分数为
和
和
.
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 8 |
| 1 |
| 12 |
| 1 |
| 18 |
| 1 |
| 24 |
| 1 |
| 6 |
| 1 |
| 18 |
| 1 |
| 6 |
| 1 |
| 18 |
分析:先用原式减去1,看看剩余的结果,要求去掉两个分数,把结果合并一下,即可得出.
解答:解:(
+
+
+
+
+
+
)-1,
=(
+
+
-
+
+
-
+
+
)-1,
=(1+
+
+
)-1,
=
+
+
,
=(
+
)+
,
=
+
.
故答案为:
,
.
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 8 |
| 1 |
| 12 |
| 1 |
| 18 |
| 1 |
| 24 |
=(
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 8 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 18 |
| 1 |
| 24 |
=(1+
| 1 |
| 8 |
| 1 |
| 18 |
| 1 |
| 24 |
=
| 1 |
| 8 |
| 1 |
| 18 |
| 1 |
| 24 |
=(
| 1 |
| 8 |
| 1 |
| 24 |
| 1 |
| 18 |
=
| 1 |
| 6 |
| 1 |
| 18 |
故答案为:
| 1 |
| 6 |
| 1 |
| 18 |
点评:此题考查学生对问题的分析与应变能力,以及考查学生对分数的拆项技巧的掌握.
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