题目内容
解方程.
①x+
=
②
-2x=
.
①x+
| 3 |
| 5 |
| 7 |
| 8 |
②
| 4 |
| 5 |
| 1 |
| 4 |
(1)x+
=
,
x+
-
=
-
,
x=
;
(2)
-2x=
,
-2x+2x=
+2x,
=
+2x,
-
=
+2x-
,
=2x,
÷2=2x÷2,
x=
.
| 3 |
| 5 |
| 7 |
| 8 |
x+
| 3 |
| 5 |
| 3 |
| 5 |
| 7 |
| 8 |
| 3 |
| 5 |
x=
| 11 |
| 40 |
(2)
| 4 |
| 5 |
| 1 |
| 4 |
| 4 |
| 5 |
| 1 |
| 4 |
| 4 |
| 5 |
| 1 |
| 4 |
| 4 |
| 5 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 11 |
| 20 |
| 11 |
| 20 |
x=
| 11 |
| 40 |
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