题目内容
计算,把结果写成最简分数:(1.| • |
| 0 |
| • |
| 6 |
| • |
| 1 |
| • |
| 8 |
| • |
| 5 |
| • |
| 4 |
| • |
| 0 |
| • |
| 4 |
| • |
| 1 |
| • |
| 2 |
| • |
| 3 |
| • |
| 6 |
分析:首先把循环小数转化成分数,1.
=1
,3.
=3
,9.
=9
,9.
=9
,3.
=3
,1.
=1
,然后进行四则运算.
| • |
| 0 |
| • |
| 6 |
| 6 |
| 99 |
| • |
| 1 |
| • |
| 8 |
| 18 |
| 99 |
| • |
| 5 |
| • |
| 4 |
| 54 |
| 99 |
| • |
| 0 |
| • |
| 4 |
| 4 |
| 99 |
| • |
| 1 |
| • |
| 2 |
| 12 |
| 99 |
| • |
| 3 |
| • |
| 6 |
| 36 |
| 99 |
解答:解:由于1.
=1
,3.
=3
,9.
=9
,9.
=9
,3.
=3
,1.
=1
,
所以(1.
+3.
+9.
)÷(9.
+3.
+1.
)=
÷
=
=
.
故答案为
| • |
| 0 |
| • |
| 6 |
| 6 |
| 99 |
| • |
| 1 |
| • |
| 8 |
| 18 |
| 99 |
| • |
| 5 |
| • |
| 4 |
| 54 |
| 99 |
| • |
| 0 |
| • |
| 4 |
| 4 |
| 99 |
| • |
| 1 |
| • |
| 2 |
| 12 |
| 99 |
| • |
| 3 |
| • |
| 6 |
| 36 |
| 99 |
所以(1.
| • |
| 0 |
| • |
| 6 |
| • |
| 1 |
| • |
| 8 |
| • |
| 5 |
| • |
| 4 |
| • |
| 0 |
| • |
| 4 |
| • |
| 1 |
| • |
| 2 |
| • |
| 3 |
| • |
| 6 |
| 1365 |
| 99 |
| 1339 |
| 99 |
| 1365 |
| 1339 |
| 105 |
| 103 |
故答案为
| 105 |
| 103 |
点评:本题主要考查有理数无理数的概念与运算,解答此题的关键是熟练掌握由循环小数转换成分数的方法,此题难度一般.
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