题目内容
解方程.
Χ+
| Χ-
| 12x-9x=8.7. |
(1)x+
=
,
x+
-
=
-
,
x=
;
(2)x-
=
,
x-
+
=
+
,
x=
;
(3)12x-9x=8.7,
3x=8.7,
3x÷3=8.7÷3,
x=2.9.
| 1 |
| 3 |
| 2 |
| 5 |
x+
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 5 |
| 1 |
| 3 |
x=
| 1 |
| 15 |
(2)x-
| 3 |
| 4 |
| 1 |
| 12 |
x-
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 12 |
| 3 |
| 4 |
x=
| 5 |
| 6 |
(3)12x-9x=8.7,
3x=8.7,
3x÷3=8.7÷3,
x=2.9.
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