题目内容
解方程.
2x-
=
x-(
+
)=
.
2x-
| 2 |
| 3 |
| 1 |
| 3 |
x-(
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 20 |
分析:(1)等式的两边同时加上
,然后等式的两边同时除以2即可;
(2)先计算
+
=
,然后等式的两边同时加上
即可.
| 2 |
| 3 |
(2)先计算
| 1 |
| 4 |
| 1 |
| 5 |
| 9 |
| 20 |
| 9 |
| 20 |
解答:解:
(1)2x-
=
,
2x-
+
=
+
,
2x=1,
2x÷2=1÷2,
x=0.5;
(2)x-(
+
)=
,
x-
=
,
x-
+
=
+
,
x=
.
(1)2x-
| 2 |
| 3 |
| 1 |
| 3 |
2x-
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
2x=1,
2x÷2=1÷2,
x=0.5;
(2)x-(
| 1 |
| 4 |
| 1 |
| 5 |
| 1 |
| 20 |
x-
| 9 |
| 20 |
| 1 |
| 20 |
x-
| 9 |
| 20 |
| 9 |
| 20 |
| 1 |
| 20 |
| 9 |
| 20 |
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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