题目内容
解方程.
x-
=
x+
=
x+
-
=2.
x-
| 5 |
| 12 |
| 3 |
| 8 |
| 3 |
| 4 |
| 5 |
| 6 |
| 2 |
| 3 |
| 1 |
| 2 |
分析:(1)根据等式的性质,两边同加上
即可;
(2)根据等式的性质,两边同减去
即可;
(3)原式变为x+
=2,根据等式的性质,两边同减去
即可.
| 5 |
| 12 |
(2)根据等式的性质,两边同减去
| 3 |
| 4 |
(3)原式变为x+
| 1 |
| 6 |
| 1 |
| 6 |
解答:解:(1)x-
=
,
x-
+
=
+
,
x=
;
(2)x+
=
,
x+
-
=
-
,
x=
;
(3)x+
-
=2,
x+
=2,
x+
-
=2-
,
x=
.
| 5 |
| 12 |
| 3 |
| 8 |
x-
| 5 |
| 12 |
| 5 |
| 12 |
| 3 |
| 8 |
| 5 |
| 12 |
x=
| 19 |
| 24 |
(2)x+
| 3 |
| 4 |
| 5 |
| 6 |
x+
| 3 |
| 4 |
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
x=
| 1 |
| 12 |
(3)x+
| 2 |
| 3 |
| 1 |
| 2 |
x+
| 1 |
| 6 |
x+
| 1 |
| 6 |
| 1 |
| 6 |
| 1 |
| 6 |
x=
| 11 |
| 6 |
点评:在解方程时应根据等式的性质,即等式两边同加上、同减去、同乘上或同除以某一个数(0除外),等式的两边仍相等,同时注意“=”上下要对齐.
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