题目内容
解方程．
X-
=3
X+
=
-X=
．
X-
| 4 |
| 5 |
X+
| 1 |
| 4 |
| 7 |
| 8 |
| 3 |
| 4 |
| 3 |
| 7 |
①x-
=3，
x-
+
=3+
，
x=3
；
②x+
=
，
x+
-
=
-
，
x=
；
③
-x=
，
-x+x=
+x，
+x=
，
+x-
=
-
，
x=
．
| 4 |
| 5 |
x-
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
x=3
| 4 |
| 5 |
②x+
| 1 |
| 4 |
| 7 |
| 8 |
x+
| 1 |
| 4 |
| 1 |
| 4 |
| 7 |
| 8 |
| 1 |
| 4 |
x=
| 5 |
| 8 |
③
| 3 |
| 4 |
| 3 |
| 7 |
| 3 |
| 4 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 4 |
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 4 |
| 3 |
| 7 |
x=
| 9 |
| 28 |
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