题目内容
解方程.
x+
=
x-
=
x+
=1.
x+
| 3 |
| 7 |
| 3 |
| 4 |
x-
| 5 |
| 12 |
| 3 |
| 8 |
x+
| 5 |
| 6 |
分析:(1)等式的两边同时减去
即可;
(2)等式的两边同时加上
即可;
(3)等式的两边同时减去
即可.
| 3 |
| 7 |
(2)等式的两边同时加上
| 5 |
| 12 |
(3)等式的两边同时减去
| 5 |
| 6 |
解答:解:
(1)x+
=
,
x+
-
=
-
,
x=
;
(2)x-
=
,
x-
+
=
+
,
x=
;
(3)x+
=1,
x+
-
=1-
,
x=
.
(1)x+
| 3 |
| 7 |
| 3 |
| 4 |
x+
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 4 |
| 3 |
| 7 |
x=
| 9 |
| 28 |
(2)x-
| 5 |
| 12 |
| 3 |
| 8 |
x-
| 5 |
| 12 |
| 5 |
| 12 |
| 3 |
| 8 |
| 5 |
| 12 |
x=
| 19 |
| 24 |
(3)x+
| 5 |
| 6 |
x+
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
x=
| 1 |
| 6 |
点评:本题主要考查解方程,根据等式的性质进行解答即可.
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