题目内容
解方程.
| x-
| 13a-7a=5 | 2-x=
|
(1)
+x=
,
+x-
=
-
,
x=
;
(2)x-
=
,
x-
+
=
+
,
x=
;
(3)13a-7a=5,
6a=5,
6a÷6=5÷6,
a=
;
(4)2-x=
,
2-x+x=
+x,
2=
+x,
2-
=
+x-
,
x=
.
| 1 |
| 9 |
| 2 |
| 3 |
| 1 |
| 9 |
| 1 |
| 9 |
| 2 |
| 3 |
| 1 |
| 9 |
x=
| 5 |
| 9 |
(2)x-
| 3 |
| 5 |
| 1 |
| 4 |
x-
| 3 |
| 5 |
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 5 |
x=
| 17 |
| 20 |
(3)13a-7a=5,
6a=5,
6a÷6=5÷6,
a=
| 5 |
| 6 |
(4)2-x=
| 6 |
| 5 |
2-x+x=
| 6 |
| 5 |
2=
| 6 |
| 5 |
2-
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
x=
| 4 |
| 5 |
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