题目内容
(1)x+
| (2)2x-
| (3)x+(
|
(1)x+
=1,
x+
-
=1-
,
x=
;
(2)2x-
=
,
2x-
+
=
+
,
2x=
,
2x÷2=
÷2,
x=
;
(3)x+(
+
)=2,
x+
=2,
x+
-
=2-
,
x=
.
| 4 |
| 7 |
x+
| 4 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
x=
| 3 |
| 7 |
(2)2x-
| 3 |
| 15 |
| 7 |
| 15 |
2x-
| 3 |
| 15 |
| 3 |
| 15 |
| 7 |
| 15 |
| 3 |
| 15 |
2x=
| 2 |
| 3 |
2x÷2=
| 2 |
| 3 |
x=
| 1 |
| 3 |
(3)x+(
| 1 |
| 3 |
| 3 |
| 4 |
x+
| 13 |
| 12 |
x+
| 13 |
| 12 |
| 13 |
| 12 |
| 13 |
| 12 |
x=
| 11 |
| 12 |
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