题目内容
| 解方程. ①3X-X=0.8 | ②X+
| ③X-
|
(1)3X-X=0.8,
2x=0.8,
2x÷2=0.8÷2,
x=0.4;
(2)X+
=
,
X+
-
=
-
,
x=
;
(3)X-
=
,
X-
+
=
+
,
x=1
.
2x=0.8,
2x÷2=0.8÷2,
x=0.4;
(2)X+
| 1 |
| 4 |
| 7 |
| 8 |
X+
| 1 |
| 4 |
| 1 |
| 4 |
| 7 |
| 8 |
| 1 |
| 4 |
x=
| 5 |
| 8 |
(3)X-
| 2 |
| 5 |
| 3 |
| 4 |
X-
| 2 |
| 5 |
| 2 |
| 5 |
| 3 |
| 4 |
| 2 |
| 5 |
x=1
| 3 |
| 20 |
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