题目内容
解方程.
x+
=
-x=
x-
=2
Ⅹ+
=
.
x+
| 3 |
| 4 |
| 7 |
| 8 |
| 11 |
| 12 |
| 5 |
| 6 |
x-
| 4 |
| 7 |
Ⅹ+
| 3 |
| 5 |
| 7 |
| 8 |
分析:(1)根据等式的性质,两边同减去
即可;
(2)根据等式的性质,两边同加上x,得
+x=
,两边同减去
即可;
(3)根据等式的性质,两边同加上
即可;
(4)根据等式的性质,两边同减去
即可.
| 3 |
| 4 |
(2)根据等式的性质,两边同加上x,得
| 5 |
| 6 |
| 11 |
| 12 |
| 5 |
| 6 |
(3)根据等式的性质,两边同加上
| 4 |
| 7 |
(4)根据等式的性质,两边同减去
| 3 |
| 5 |
解答:解:(1)x+
=
,
x+
-
=
-
,
x=
;
(2)
-x=
,
-x=
+x,
+x=
,
+x-
=
-
,
x=
;
(3)x-
=2,
x-
+
=2+
,
x=2
;
(4)Ⅹ+
=
,
Ⅹ+
-
=
-
,
X=
.
| 3 |
| 4 |
| 7 |
| 8 |
x+
| 3 |
| 4 |
| 3 |
| 4 |
| 7 |
| 8 |
| 3 |
| 4 |
x=
| 1 |
| 8 |
(2)
| 11 |
| 12 |
| 5 |
| 6 |
| 11 |
| 12 |
| 5 |
| 6 |
| 5 |
| 6 |
| 11 |
| 12 |
| 5 |
| 6 |
| 5 |
| 6 |
| 11 |
| 12 |
| 5 |
| 6 |
x=
| 1 |
| 12 |
(3)x-
| 4 |
| 7 |
x-
| 4 |
| 7 |
| 4 |
| 7 |
| 4 |
| 7 |
x=2
| 4 |
| 7 |
(4)Ⅹ+
| 3 |
| 5 |
| 7 |
| 8 |
Ⅹ+
| 3 |
| 5 |
| 3 |
| 5 |
| 7 |
| 8 |
| 3 |
| 5 |
X=
| 11 |
| 40 |
点评:在解方程时应根据等式的性质,即等式两边同加上、同减去或同除以、同乘上某一个数(0除外),等式的两边仍相等,同时注意等号上下要对齐.
练习册系列答案
相关题目