题目内容
计算:(1-
)÷(1-
)÷(1-
)÷…÷(1-
)÷(1-
)
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 9 |
| 1 |
| 10 |
考点:分数的巧算
专题:计算问题(巧算速算)
分析:先计算出每个括号内的结果,然后把除法变为乘法,约分计算.
解答:
解:(1-
)÷(1-
)÷(1-
)÷…÷(1-
)÷(1-
)
=
÷
÷
÷
÷
=
×
×
×…×
×
=2.5
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 9 |
| 1 |
| 10 |
=
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
| 8 |
| 9 |
| 9 |
| 10 |
=
| 1 |
| 2 |
| 3 |
| 2 |
| 4 |
| 3 |
| 9 |
| 8 |
| 10 |
| 9 |
=2.5
点评:认真分析数据,采取灵活的方法进行简算.
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