题目内容
计算:(1-| 1 |
| 22 |
| 1 |
| 32 |
| 1 |
| 20062 |
| 1 |
| 20072 |
分析:每一个因数都可使用平方差公式运算,再通分,寻找约分规律.
解答:解:原式=(1-
)(1+
)(1-
)(1+
)×…×(1-
)(1+
)(1-
)(1+
)
=
×[
×
×
×
×…×
×
]×
=
×
=
.
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 2006 |
| 1 |
| 2006 |
| 1 |
| 2007 |
| 1 |
| 2007 |
=
| 1 |
| 2 |
| 3 |
| 2 |
| 2 |
| 3 |
| 4 |
| 3 |
| 3 |
| 4 |
| 2007 |
| 2006 |
| 2006 |
| 2007 |
| 2008 |
| 2007 |
=
| 1 |
| 2 |
| 2008 |
| 2007 |
| 1004 |
| 2007 |
点评:本题考查了平方差公式在实数运算中的运用,关键是使用平方差公式后寻找约分的规律.
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