题目内容
x-
=
x+
=1
-x=
.
| 2 |
| 7 |
| 3 |
| 13 |
x+
| 5 |
| 9 |
| 1 |
| 3 |
| 3 |
| 5 |
| 1 |
| 12 |
考点:方程的解和解方程
专题:简易方程
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,方程两边同时加x,再同时减
求解.
| 2 |
| 7 |
(2)依据等式的性质,方程两边同时减
| 5 |
| 9 |
(3)依据等式的性质,方程两边同时加x,再同时减
| 1 |
| 12 |
解答:
解:(1)x-
=
x-
+
=
+
x=
;
(2)x+
=1
x+
-
=1
-
x=
;
(3)
-x=
-x+x=
+x
-
=
+x-
x=
.
| 2 |
| 7 |
| 3 |
| 13 |
x-
| 2 |
| 7 |
| 2 |
| 7 |
| 3 |
| 13 |
| 2 |
| 7 |
x=
| 47 |
| 91 |
(2)x+
| 5 |
| 9 |
| 1 |
| 3 |
x+
| 5 |
| 9 |
| 5 |
| 9 |
| 1 |
| 3 |
| 5 |
| 9 |
x=
| 7 |
| 9 |
(3)
| 3 |
| 5 |
| 1 |
| 12 |
| 3 |
| 5 |
| 1 |
| 12 |
| 3 |
| 5 |
| 1 |
| 12 |
| 1 |
| 12 |
| 1 |
| 12 |
x=
| 31 |
| 60 |
点评:依据等式的性质解方程是本题考查的知识点.
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