题目内容
| 解下列方程. 7X-3.4X=0.72 | 1-X=
| X-
|
(1)7X-3.4X=0.72,
(7-3.4)X=0.72,
3.6X=0.72,
3.6X÷3.6=0.72÷3.6,
X=0.2;
(2)1-X=
+
,
1-X=
,
1-X+X=
+X,
+X=1,
+X-
=1-
,
X=
;
(3)X-
=
,
X-
+
=
+
,
X=
.
(7-3.4)X=0.72,
3.6X=0.72,
3.6X÷3.6=0.72÷3.6,
X=0.2;
(2)1-X=
| 1 |
| 5 |
| 2 |
| 5 |
1-X=
| 3 |
| 5 |
1-X+X=
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
X=
| 2 |
| 5 |
(3)X-
| 3 |
| 7 |
| 2 |
| 14 |
X-
| 3 |
| 7 |
| 3 |
| 7 |
| 2 |
| 14 |
| 3 |
| 7 |
X=
| 4 |
| 7 |
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