题目内容
计算:(1-
)(1-
)(1-
)…(1-
)等于( )
| 1 |
| 22 |
| 1 |
| 32 |
| 1 |
| 42 |
| 1 |
| 20072 |
A、
| ||
B、
| ||
C、
| ||
D、
|
分析:利用平方差公式将每一个括号部分因式分解,寻找约分规律.
解答:解:原式=(1-
)(1+
)(1-
)(1+
)(1-
)(1+
)…(1-
)(1+
)
=
×
×
×
×
×
×…×
×
=
×
=
.
故选A.
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 2007 |
| 1 |
| 2007 |
=
| 1 |
| 2 |
| 3 |
| 2 |
| 2 |
| 3 |
| 4 |
| 3 |
| 3 |
| 4 |
| 5 |
| 4 |
| 2006 |
| 2007 |
| 2008 |
| 2007 |
=
| 1 |
| 2 |
| 2008 |
| 2007 |
=
| 1004 |
| 2007 |
故选A.
点评:本题考查了平方差公式的运用,利用公式能简化运算.
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