题目内容
(2012?中山模拟)解方程.
Χ-
=2-
.
Χ-
| Χ-1 |
| 2 |
| Χ+2 |
| 3 |
分析:先化简方程,再依据等式的性质,方程两边同时加
x,再同时减
,最后同时除以
求解.
| 1 |
| 3 |
| 1 |
| 2 |
| 5 |
| 6 |
解答:解:x-
=2-
,
x-
x+
=2-
x-
,
x+
=
-
x,
x+
+
x=
-
x+
x,
x+
-
=
-
,
x=
,
x÷
=
÷
,
x=1.
| Χ-1 |
| 2 |
| Χ+2 |
| 3 |
x-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
| 4 |
| 3 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 4 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 2 |
| 4 |
| 3 |
| 1 |
| 2 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
x=1.
点评:本题主要考查学生依据等式的性质解方程的能力,本题解答的难点是把原方程化简.解方程时注意对齐等号.
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