题目内容
解方程.
+x=
x-
=
x-
=
+x=
.
| 1 |
| 7 |
| 2 |
| 3 |
x-
| 7 |
| 15 |
| 2 |
| 5 |
x-
| 6 |
| 7 |
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 5 |
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,方程两边同时减
求解,
(2)依据等式的性质,方程两边同时加
求解,
(3)依据等式的性质,方程两边同时加
求解,
(4)依据等式的性质,方程两边同时减
求解.
| 1 |
| 7 |
(2)依据等式的性质,方程两边同时加
| 7 |
| 15 |
(3)依据等式的性质,方程两边同时加
| 6 |
| 7 |
(4)依据等式的性质,方程两边同时减
| 1 |
| 3 |
解答:
解:(1)
+x=
+x-
=
-
x=
;
(2)x-
=
x-
+
=
+
x=
;
(3)x-
=
x-
+
=
+
x=1
;
(4)
+x=
+x-
=
-
x=
.
| 1 |
| 7 |
| 2 |
| 3 |
| 1 |
| 7 |
| 1 |
| 7 |
| 2 |
| 3 |
| 1 |
| 7 |
x=
| 11 |
| 21 |
(2)x-
| 7 |
| 15 |
| 2 |
| 5 |
x-
| 7 |
| 15 |
| 7 |
| 15 |
| 2 |
| 5 |
| 7 |
| 15 |
x=
| 13 |
| 15 |
(3)x-
| 6 |
| 7 |
| 2 |
| 3 |
x-
| 6 |
| 7 |
| 6 |
| 7 |
| 2 |
| 3 |
| 6 |
| 7 |
x=1
| 11 |
| 21 |
(4)
| 1 |
| 3 |
| 2 |
| 5 |
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 5 |
| 1 |
| 3 |
x=
| 1 |
| 15 |
点评:等式的性质是解方程的依据,解方程时注意对齐等号.
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