题目内容
已知:|a-1|与|ab-2|互为相反数,解关于x的方程
+
+
+
+…+
=1004.
| x |
| a(b+1) |
| x |
| (a+2)(b+3) |
| x |
| (a+4)(b+5) |
| x |
| (a+6)(b+7) |
| x |
| (a+2006)(b+2007) |
∵|a-1|+|ab-2|=0,
∴a-1=0,ab-2=0,
解得a=1,b=2,
将a=1,b=2代入方程,得
+
+
+…+
=1004,
x(
+
+
+…+
)=1004,
x(1-
+
-
+
-
+…+
-
)=1004,(6分)
x(1-
)=1004,
x=1004,
∴x=2009.
∴a-1=0,ab-2=0,
解得a=1,b=2,
将a=1,b=2代入方程,得
| x |
| 1×3 |
| x |
| 3×5 |
| x |
| 5×7 |
| x |
| 2007×2009 |
x(
| 1 |
| 1×3 |
| 1 |
| 3×5 |
| 1 |
| 5×7 |
| 1 |
| 2007×2009 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 7 |
| 1 |
| 2007 |
| 1 |
| 2009 |
| 1 |
| 2 |
| 1 |
| 2009 |
| 1004 |
| 2009 |
∴x=2009.
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