题目内容
99×(1-
)×(1-
)×(1-
)×…×(1-
)
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 100 |
分析:把每个括号内的结果求出来,原式变为99×
×
×
×…×
×
,然后通过约分,即可得出结果.
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
| 98 |
| 99 |
| 99 |
| 100 |
解答:解:99×(1-
)×(1-
)×(1-
)×…×(1-
),
=99×
×
×
×…×
×
,
=99×
,
=
.
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 100 |
=99×
| 1 |
| 2 |
| 2 |
| 3 |
| 3 |
| 4 |
| 98 |
| 99 |
| 99 |
| 100 |
=99×
| 1 |
| 100 |
=
| 99 |
| 100 |
点评:此题应注意审题,认真分析式中数据,根据数字特点,运用运算技巧,求得简便的算法.
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