题目内容
x-
|
|
2x-
|
x+(
|
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)等式的两边同时加上
,然后等式的两边同时除以2即可;
(4)先计算
-
=
,然后等式的两边同时减去
即可.
| 1 |
| 3 |
(2)等式的两边同时加上x,把原式改写成x+
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
(3)等式的两边同时加上
| 3 |
| 10 |
(4)先计算
| 3 |
| 8 |
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
解答:解:
(1)x-
=
,
x-
+
=
+
,
x=
;
(2)
-x=
,
-x+x=
+x,
x+
=
,
x+
-
=
-
,
x=
;
(3)2x-
=
,
2x-
+
=
+
,
2x=2,
2x÷2=2÷2,
x=1;
(4)x+(
-
)=
,
x+
=
,
x+
-
=
-
,
x=
.
(1)x-
| 1 |
| 3 |
| 1 |
| 2 |
x-
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
x=
| 5 |
| 6 |
(2)
| 5 |
| 6 |
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
x+
| 3 |
| 4 |
| 5 |
| 6 |
x+
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
x=
| 1 |
| 12 |
(3)2x-
| 3 |
| 10 |
| 17 |
| 10 |
2x-
| 3 |
| 10 |
| 3 |
| 10 |
| 17 |
| 10 |
| 3 |
| 10 |
2x=2,
2x÷2=2÷2,
x=1;
(4)x+(
| 3 |
| 8 |
| 1 |
| 4 |
| 5 |
| 8 |
x+
| 1 |
| 8 |
| 5 |
| 8 |
x+
| 1 |
| 8 |
| 1 |
| 8 |
| 5 |
| 8 |
| 1 |
| 8 |
x=
| 1 |
| 2 |
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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