题目内容
解方程.
x+
=
x-
=
-x=
.
x+
| 3 |
| 7 |
| 4 |
| 5 |
x-
| 3 |
| 8 |
| 1 |
| 2 |
| 4 |
| 5 |
| 1 |
| 5 |
分析:(1)x+
=
,方程两边同时减
便得解;
(2)x-
=
,方程两边同时加
即可;
(3)
-x=
,方程两边同时加上x,然后两边同时减去
即可.
| 3 |
| 7 |
| 4 |
| 5 |
| 3 |
| 7 |
(2)x-
| 3 |
| 8 |
| 1 |
| 2 |
| 3 |
| 8 |
(3)
| 4 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
解答:解:(1)x+
=
x+
-
=
-
x=
;
(2)x-
=
x-
+
=
+
x=
;
(3)
-x=
-x+x=
+x
-
=
+x-
x=
.
| 3 |
| 7 |
| 4 |
| 5 |
x+
| 3 |
| 7 |
| 3 |
| 7 |
| 4 |
| 5 |
| 3 |
| 7 |
x=
| 13 |
| 35 |
(2)x-
| 3 |
| 8 |
| 1 |
| 2 |
x-
| 3 |
| 8 |
| 3 |
| 8 |
| 1 |
| 2 |
| 3 |
| 8 |
x=
| 7 |
| 8 |
(3)
| 4 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
x=
| 3 |
| 5 |
点评:此题考查的目的是理解方程的意义,掌握根据等式的性质解方程的方法步骤.
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