题目内容
计算:(1-
)(1-
)(1-
)…(1-
)(1-
).
| 1 |
| 22 |
| 1 |
| 32 |
| 1 |
| 42 |
| 1 |
| 20072 |
| 1 |
| 20082 |
分析:将每一项用平方差公式展开然后计算即可.
解答:解:原式=(1-
)(1+
)(1-
)(1+
)…(1-
)(1+
)(1-
)(1+
)
=(1-
)(1+
)
=
.
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 2007 |
| 1 |
| 2007 |
| 1 |
| 2008 |
| 1 |
| 2008 |
=(1-
| 1 |
| 2 |
| 1 |
| 2008 |
=
| 2009 |
| 4016 |
点评:本题考查了运用公式法因式分解,解题的关键是熟练掌握平方差公式的形式.
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