题目内容
200×(1-
)×(1-
)×…×(1-
).
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 100 |
200×(1-
)×(1-
)×…+(1-
),
=200×
×
×…×
,
=200×
,
=2.
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 100 |
=200×
| 1 |
| 2 |
| 2 |
| 3 |
| 99 |
| 100 |
=200×
| 1 |
| 100 |
=2.
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| 100 |
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