题目内容
| 解方程: (1)2x-
| (2)x+
| (3)2.5x-1.3x=1.44 | (4)
|
(1)2x-
=
2x-
+
=
+
,
2x=2,
2x÷2=2÷2,
x=1;
(2)x+
=2
x+
-
=2-
,
x=1
;
(3)2.5x-1.3x=1.44
(2.5-1.3)x=1.44,
1.2x=1.44,
1.2x÷1.2=1.44÷1.2,
x=1.2;
(4)
:
=x:
x=
×
,
x=
,
x÷
=
÷
,
x=
.
| 2 |
| 3 |
| 4 |
| 3 |
2x-
| 2 |
| 3 |
| 2 |
| 3 |
| 4 |
| 3 |
| 2 |
| 3 |
2x=2,
2x÷2=2÷2,
x=1;
(2)x+
| 4 |
| 5 |
x+
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
x=1
| 1 |
| 5 |
(3)2.5x-1.3x=1.44
(2.5-1.3)x=1.44,
1.2x=1.44,
1.2x÷1.2=1.44÷1.2,
x=1.2;
(4)
| 1 |
| 4 |
| 1 |
| 8 |
| 1 |
| 10 |
| 1 |
| 8 |
| 1 |
| 4 |
| 1 |
| 10 |
| 1 |
| 8 |
| 1 |
| 40 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 40 |
| 1 |
| 8 |
x=
| 1 |
| 5 |
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