题目内容
已知|a-1|+
=0,则
+
+
+…+
=
.
| b-2 |
| 1 |
| ab |
| 1 |
| (a+1)(b+1) |
| 1 |
| (a+2)(b+2) |
| 1 |
| (a+2012)(b+2012) |
| 2013 |
| 2014 |
| 2013 |
| 2014 |
分析:先根据非负数的性质求出a、b的值,再代入所求代数式,找出规律进行计算即可.
解答:解:∵|a-1|+
=0,
∴a=1,b=2,
∴原式=
+
+
+…+
,
∵
=1-
,
=
-
,
=
-
…,
∴
=
-
,
∴原式=1-
+
-
+
-
+…+
-
=1-
=
.
故答案为:
.
| b-2 |
∴a=1,b=2,
∴原式=
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 2013×2014 |
∵
| 1 |
| 1×2 |
| 1 |
| 2 |
| 1 |
| 2×3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3×4 |
| 1 |
| 3 |
| 1 |
| 4 |
∴
| 1 |
| n×(n+1) |
| 1 |
| n |
| 1 |
| n+1 |
∴原式=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2013 |
| 1 |
| 2014 |
=1-
| 1 |
| 2014 |
=
| 2013 |
| 2014 |
故答案为:
| 2013 |
| 2014 |
点评:本题考查的是实数的运算,根据题意找出规律,根据此规律进行计算即可.
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