题目内容
解方程.
x+
=
x-
=
-x=
.
x+
| 3 |
| 7 |
| 3 |
| 4 |
| 5 |
| 12 |
| 3 |
| 8 |
| 3 |
| 4 |
| 1 |
| 16 |
分析:(1)根据等式的性质,在方程两边同时减去
求解;
(2)根据等式的性质,在方程两边同时加
求解;
(3)根据等式的性质,在方程两边同时加x,再减
求解.
| 3 |
| 7 |
(2)根据等式的性质,在方程两边同时加
| 5 |
| 12 |
(3)根据等式的性质,在方程两边同时加x,再减
| 1 |
| 16 |
解答:解:(1)x+
=
,
x+
-
=
-
,
x=
;
(2)x-
=
,
x-
+
=
+
,
x=
;
(3)
-x=
,
-x+x=
+x,
-
=
+x-
,
x=
.
| 3 |
| 7 |
| 3 |
| 4 |
x+
| 3 |
| 7 |
| 3 |
| 7 |
| 3 |
| 4 |
| 3 |
| 7 |
x=
| 9 |
| 28 |
(2)x-
| 5 |
| 12 |
| 3 |
| 8 |
x-
| 5 |
| 12 |
| 5 |
| 12 |
| 3 |
| 8 |
| 5 |
| 12 |
x=
| 19 |
| 24 |
(3)
| 3 |
| 4 |
| 1 |
| 16 |
| 3 |
| 4 |
| 1 |
| 16 |
| 3 |
| 4 |
| 1 |
| 16 |
| 1 |
| 16 |
| 1 |
| 16 |
x=
| 11 |
| 16 |
点评:本题主要考查了学生根据等式的性质解方程的能力.注意等号对齐.
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