题目内容
化简| 1 |
| a |
| 1 |
| b |
| 1 |
| a |
| 1 |
| c |
| 1 |
| a |
| 1 |
| b |
| 1 |
| d |
| 1 |
| a |
| 1 |
| b |
| 1 |
| c |
| 1 |
| a |
| 1 |
| b |
| 1 |
| c |
| 1 |
| d |
分析:首先计算最后两项,提取公因式,然后再计算所得式子的后边的两项,依次计算即可.
解答:解:原式=
+
(1+
)+
(1+
)(1+
)+(1+
)(1+
)(1+
)(
-1-
)
=
+
(1+
)+
(1+
)(1+
)-(1+
)(1+
)(1+
)
=
+
(1+
)+(1+
)(1+
)(
-1-
)
=
+
(1+
)-(1+
)(1+
)
=
-(1+
)
=-1
故答案是:-1.
| 1 |
| a |
| 1 |
| b |
| 1 |
| a |
| 1 |
| c |
| 1 |
| a |
| 1 |
| b |
| 1 |
| a |
| 1 |
| b |
| 1 |
| c |
| 1 |
| d |
| 1 |
| d |
=
| 1 |
| a |
| 1 |
| b |
| 1 |
| a |
| 1 |
| c |
| 1 |
| a |
| 1 |
| b |
| 1 |
| a |
| 1 |
| b |
| 1 |
| c |
=
| 1 |
| a |
| 1 |
| b |
| 1 |
| a |
| 1 |
| a |
| 1 |
| b |
| 1 |
| c |
| 1 |
| c |
=
| 1 |
| a |
| 1 |
| b |
| 1 |
| a |
| 1 |
| a |
| 1 |
| b |
=
| 1 |
| a |
| 1 |
| a |
=-1
故答案是:-1.
点评:本题主要考查了分式的化简求值,正确观察式子的特点是解题的关键.
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| a |
| 1 |
| b |
| ab |
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A、
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