题目内容
| 解方程. x-
| x-
| 3a-a=4.2 | x+
|
(1)x-
=0.5,
x-
+
=0.5+
,
x=
;
(2)x-
=
,
x-
+
=
+
,
x=
;
(3)3a-a=4.2,
2a=4.2,
2a÷2=4.2÷2,
a=2.1;
(4)x+
=
,
x+
-
=
-
.
x=
.
| 3 |
| 4 |
x-
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
x=
| 5 |
| 4 |
(2)x-
| 5 |
| 7 |
| 1 |
| 3 |
x-
| 5 |
| 7 |
| 5 |
| 7 |
| 1 |
| 3 |
| 5 |
| 7 |
x=
| 22 |
| 21 |
(3)3a-a=4.2,
2a=4.2,
2a÷2=4.2÷2,
a=2.1;
(4)x+
| 1 |
| 4 |
| 5 |
| 6 |
x+
| 1 |
| 4 |
| 1 |
| 4 |
| 5 |
| 6 |
| 1 |
| 4 |
x=
| 7 |
| 12 |
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