题目内容
解方程.
(1)
|
(2)x-
|
(3)4x-x=7.8. |
(1)
+x=
;
+x-
=
-
,
x=
;
(2)x-
=
,
x-
+
=
+
,
x=
;
(3)4x-x=7.8,
(4-1)x=7.8,
3x=7.8,
3x÷3=7.8÷3,
x=2.6.
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 8 |
x=
| 3 |
| 8 |
(2)x-
| 1 |
| 6 |
| 1 |
| 3 |
x-
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 6 |
x=
| 1 |
| 2 |
(3)4x-x=7.8,
(4-1)x=7.8,
3x=7.8,
3x÷3=7.8÷3,
x=2.6.
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