题目内容
阅读下列材料:| 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 |
分析:由于
+
+
可以变形为
(
-
)+
(
-
)+
(
-
),再两两抵消化简后把分式方程化为整式方程来解答.
| 1 |
| x(x+3) |
| 1 |
| (x+3)(x+6) |
| 1 |
| (x+6)(x+9) |
| 1 |
| 3 |
| 1 |
| x |
| 1 |
| x+3 |
| 1 |
| 3 |
| 1 |
| x+3 |
| 1 |
| x+6 |
| 1 |
| 3 |
| 1 |
| x+6 |
| 1 |
| x+9 |
解答:解:
+
+
=
,
(
-
)+
(
-
)+
(
-
)=
,
(
-
)=
,
2(x+9)-2x=9x,
解得x=2.
经检验:x=2是原方程的解.
| 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.
点评:将
+
+
变形为
(
-
)+
(
-
)+
(
-
)是解题的关键.
| 1 |
| x(x+3) |
| 1 |
| (x+3)(x+6) |
| 1 |
| (x+6)(x+9) |
| 1 |
| 3 |
| 1 |
| x |
| 1 |
| x+3 |
| 1 |
| 3 |
| 1 |
| x+3 |
| 1 |
| x+6 |
| 1 |
| 3 |
| 1 |
| x+6 |
| 1 |
| x+9 |
练习册系列答案
相关题目