题目内容
计算:(1-| 1 |
| 22 |
| 1 |
| 32 |
| 1 |
| 42 |
| 1 |
| 20072 |
| 1 |
| 20082 |
分析:先将分式变形为
×
×
×…×
×
,再约分计算即可.
| 1×3 |
| 22 |
| 2×4 |
| 32 |
| 3×5 |
| 42 |
| 2006×2008 |
| 20072 |
| 2007×2009 |
| 20082 |
解答:解:(1-
)(1-
)(1-
)•…•(1-
)(1-
)
=
×
×
×…×
×
=
×
×
×…×
×
=
=
.
故答案为:
.
| 1 |
| 22 |
| 1 |
| 32 |
| 1 |
| 42 |
| 1 |
| 20072 |
| 1 |
| 20082 |
=
| 22-1 |
| 22 |
| 32-1 |
| 32 |
| 42-1 |
| 42 |
| 20072-1 |
| 20072 |
| 20082-1 |
| 20082 |
=
| 1×3 |
| 22 |
| 2×4 |
| 32 |
| 3×5 |
| 42 |
| 2006×2008 |
| 20072 |
| 2007×2009 |
| 20082 |
=
| 1×2×2008×2009 |
| 22×20082 |
=
| 2009 |
| 4016 |
故答案为:
| 2009 |
| 4016 |
点评:本题考查了分式的混合运算,解题的关键是将括号里面的减法通分后,运用平方差公式计算,再约分.
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