题目内容
解下列方程.
x-
=
+x=
x+
=
.
x-
| 5 |
| 12 |
| 1 |
| 8 |
| 4 |
| 5 |
| 5 |
| 6 |
x+
| 1 |
| 6 |
| 3 |
| 4 |
分析:(1)依据等式的性质,方程两边同时加
求解,
(2)依据等式的性质,方程两边同时减
求解,
(3)依据等式的性质,方程两边同时减
求解.
| 5 |
| 12 |
(2)依据等式的性质,方程两边同时减
| 4 |
| 5 |
(3)依据等式的性质,方程两边同时减
| 1 |
| 6 |
解答:解:(1)x-
=
,
x-
+
=
+
,
x=
;
(2)
+x=
,
+x-
=
-
,
x=
;
(3)x+
=
,
x+
-
=
-
,
x=
.
| 5 |
| 12 |
| 1 |
| 8 |
x-
| 5 |
| 12 |
| 5 |
| 12 |
| 1 |
| 8 |
| 5 |
| 12 |
x=
| 13 |
| 24 |
(2)
| 4 |
| 5 |
| 5 |
| 6 |
| 4 |
| 5 |
| 4 |
| 5 |
| 5 |
| 6 |
| 4 |
| 5 |
x=
| 1 |
| 30 |
(3)x+
| 1 |
| 6 |
| 3 |
| 4 |
x+
| 1 |
| 6 |
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
x=
| 7 |
| 12 |
点评:解方程的依据是等式的性质,解方程时注意对齐等号.
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