题目内容
解方程.
①Χ-
=
②
+Χ=
③Χ+
=3
④
-Χ=
.
①Χ-
| 8 |
| 15 |
| 2 |
| 5 |
②
| 1 |
| 5 |
| 9 |
| 20 |
③Χ+
| 5 |
| 9 |
④
| 5 |
| 6 |
| 1 |
| 4 |
(1)x-
=
,
x-
+
=
+
,
x=
;
(2)
+x=
,
+x-
=
-
,
x=
;
(3)x+
=3,
x+
-
=3-
,
x=2
;
(4)
-x=
,
-x+x=
+x,
-
=
+x-
,
x=
.
| 8 |
| 15 |
| 2 |
| 5 |
x-
| 8 |
| 15 |
| 8 |
| 15 |
| 2 |
| 5 |
| 8 |
| 15 |
x=
| 14 |
| 15 |
(2)
| 1 |
| 5 |
| 9 |
| 20 |
| 1 |
| 5 |
| 1 |
| 5 |
| 9 |
| 20 |
| 1 |
| 5 |
x=
| 1 |
| 4 |
(3)x+
| 5 |
| 9 |
x+
| 5 |
| 9 |
| 5 |
| 9 |
| 5 |
| 9 |
x=2
| 4 |
| 9 |
(4)
| 5 |
| 6 |
| 1 |
| 4 |
| 5 |
| 6 |
| 1 |
| 4 |
| 5 |
| 6 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
x=
| 7 |
| 12 |
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