题目内容
解方程
2x-
|
x-
|
|
分析:(1)等式的两边同时加上
,然后等式的两边再同时除以2即可;
(2)先计算x-
x=
x,然后等式的两边同时除以
即可;
(3)等式的两边同时乘
,然后等式的两边同时除以
即可.
| 3 |
| 4 |
(2)先计算x-
| 1 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
(3)等式的两边同时乘
| 5 |
| 14 |
| 5 |
| 7 |
解答:解:
(1)2x-
=
,
2x-
+
=
+
,
2x=
,
2x÷2=
÷2,
x=
;
(2)x-
x=
,
x=
,
x÷
=
÷
,
x=
;
(3)
x÷
=
,
x÷
×
=
×
,
x=
×
,
x÷
=
×
÷
,
x=
×
×
,
x=
.
(1)2x-
| 3 |
| 4 |
| 1 |
| 8 |
2x-
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 8 |
| 3 |
| 4 |
2x=
| 7 |
| 8 |
2x÷2=
| 7 |
| 8 |
x=
| 7 |
| 16 |
(2)x-
| 1 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 5 |
| 3 |
| 4 |
x=
| 4 |
| 5 |
(3)
| 5 |
| 7 |
| 5 |
| 14 |
| 7 |
| 8 |
| 5 |
| 7 |
| 5 |
| 14 |
| 5 |
| 14 |
| 7 |
| 8 |
| 5 |
| 14 |
| 5 |
| 7 |
| 7 |
| 8 |
| 5 |
| 14 |
| 5 |
| 7 |
| 5 |
| 7 |
| 7 |
| 8 |
| 5 |
| 14 |
| 5 |
| 7 |
x=
| 7 |
| 8 |
| 5 |
| 14 |
| 7 |
| 5 |
x=
| 7 |
| 16 |
点评:本题主要考查解方程,根据等式的性质进行解答即可.
练习册系列答案
相关题目