题目内容
解方程
-χ=
+χ=
.
| 5 |
| 6 |
| 1 |
| 2 |
| 2 |
| 9 |
| 5 |
| 18 |
(1)
-x=
,
-x+x-
=
+x-
,
=x,
x=
;
(2)
+x=
,
+x-
=
-
,
x=
.
| 5 |
| 6 |
| 1 |
| 2 |
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
x=
| 1 |
| 3 |
(2)
| 2 |
| 9 |
| 5 |
| 18 |
| 2 |
| 9 |
| 2 |
| 9 |
| 5 |
| 18 |
| 2 |
| 9 |
x=
| 1 |
| 18 |
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