题目内容
计算:(1-
)×(1-
)×(1-
)×…×(1-
)=______.
| 1 |
| 22 |
| 1 |
| 32 |
| 1 |
| 42 |
| 1 |
| 20092 |
原式=(1+
)(1-
)×(1+
)(1-
)×(1+
)(1-
)×…×(1+
)(1-
),
=
.
故答案为
.
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 2009 |
| 1 |
| 2009 |
=
| 1005 |
| 2009 |
故答案为
| 1005 |
| 2009 |
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