题目内容
解下列方程.
x-
=
-x=
+x=
.
x-
| 1 |
| 5 |
| 7 |
| 20 |
| 7 |
| 8 |
| 1 |
| 6 |
| 1 |
| 4 |
| 9 |
| 10 |
分析:(1)等式的两边同时加上
即可;
(2)等式的两边同时加上x,把原式改写成x+
=
,然后等式的两边同时减去
即可;
(3)等式的两边同时除以减去
即可.
| 1 |
| 5 |
(2)等式的两边同时加上x,把原式改写成x+
| 1 |
| 6 |
| 7 |
| 8 |
| 1 |
| 6 |
(3)等式的两边同时除以减去
| 1 |
| 4 |
解答:解:
(1)x-
=
,
x-
+
=
+
,
x=
;
(2)
-x=
,
-x+x=
+x,
x+
=
,
x+
-
=
-
,
x=
;
(3)
+x=
,
+x-
=
-
,
x=
.
(1)x-
| 1 |
| 5 |
| 7 |
| 20 |
x-
| 1 |
| 5 |
| 1 |
| 5 |
| 7 |
| 20 |
| 1 |
| 5 |
x=
| 11 |
| 20 |
(2)
| 7 |
| 8 |
| 1 |
| 6 |
| 7 |
| 8 |
| 1 |
| 6 |
x+
| 1 |
| 6 |
| 7 |
| 8 |
x+
| 1 |
| 6 |
| 1 |
| 6 |
| 7 |
| 8 |
| 1 |
| 6 |
x=
| 17 |
| 24 |
(3)
| 1 |
| 4 |
| 9 |
| 10 |
| 1 |
| 4 |
| 1 |
| 4 |
| 9 |
| 10 |
| 1 |
| 4 |
x=
| 13 |
| 20 |
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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