题目内容
阅读下列材料：
=
(1-
)，
=
(
-
)，
=
(
-
)，…
受此启发，请你解下面的方程：
+
+
=
．
| 1 |
| 1×3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3×5 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 5×7 |
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 7 |
受此启发，请你解下面的方程：
| 1 |
| x(x+3) |
| 1 |
| (x+3)(x+6) |
| 1 |
| (x+6)(x+9) |
| 3 |
| 2x+18 |
| 1 |
| x(x+3) |
| 1 |
| (x+3)(x+6) |
| 1 |
| (x+6)(x+9) |
| 3 |
| 2x+18 |
| 1 |
| 3 |
| 1 |
| x |
| 1 |
| x+3 |
| 1 |
| 3 |
| 1 |
| x+3 |
| 1 |
| x+6 |
| 1 |
| 3 |
| 1 |
| x+6 |
| 1 |
| x+9 |
| 3 |
| 2x+18 |
| 1 |
| 3 |
| 1 |
| x |
| 1 |
| x+9 |
| 3 |
| 2x+18 |
2（x+9）-2x=9x，
解得x=2．
经检验：x=2是原方程的解．
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