题目内容
计算,把结果写成若干个分母是质数的既约分数之和:| 1 |
| 9 |
| 5 |
| 9 |
| 1 |
| 19 |
| 1 |
| 95 |
| 1 |
| 1995 |
分析:首先求出
+
=
,-
+
=-
,然后把分数
、-
和-
化成同分母,即可得原式之和为
,再根据即约分数的知识把
写成两个分数之和.
| 1 |
| 9 |
| 5 |
| 9 |
| 2 |
| 3 |
| 1 |
| 19 |
| 1 |
| 95 |
| 4 |
| 95 |
| 2 |
| 3 |
| 4 |
| 95 |
| 1 |
| 1995 |
| 83 |
| 133 |
| 83 |
| 133 |
解答:解:
+
-
+
-
=
-
-
,
=
,
=
,
知133=7×19,
=
+
,
故答案为
+
.
| 1 |
| 9 |
| 5 |
| 9 |
| 1 |
| 19 |
| 1 |
| 95 |
| 1 |
| 1995 |
=
| 2 |
| 3 |
| 4 |
| 95 |
| 1 |
| 1995 |
=
| (1330-84-1) |
| 1995 |
=
| 83 |
| 133 |
知133=7×19,
| 83 |
| 133 |
| 4 |
| 7 |
| 1 |
| 19 |
故答案为
| 4 |
| 7 |
| 1 |
| 19 |
点评:本题主要考查有理数无理数的概念与运算的知识点,解答本题的关键是熟练掌握即约分数的概念,此题难度一般.
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