题目内容
先观察下列等式,再完成题后问题:
=
-
,
=
-
,
=
-
(1)请你猜想:
=______.
(2)若a、b为有理数,且|a-1|+(ab-2)2=0,求:
+
+
+…+
的值.
| 1 |
| 2×3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3×4 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4×5 |
| 1 |
| 4 |
| 1 |
| 5 |
(1)请你猜想:
| 1 |
| 2010×2011 |
(2)若a、b为有理数,且|a-1|+(ab-2)2=0,求:
| 1 |
| ab |
| 1 |
| (a+1)(b+1) |
| 1 |
| (a+2)(b+2) |
| 1 |
| (a+2009)(b+2009) |
(1)
=
-
(2分)
(2)∵|a-1|+(ab-2)2=0,
∴a-1=0,ab-2=0,
∴a=1,b=2(2分)
原式=1-
+
-
+…+
-
(2分)
=
.(1分)
| 1 |
| 2010×2011 |
| 1 |
| 2010 |
| 1 |
| 2011 |
(2)∵|a-1|+(ab-2)2=0,
∴a-1=0,ab-2=0,
∴a=1,b=2(2分)
原式=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2010 |
| 1 |
| 2011 |
=
| 2010 |
| 2011 |
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