题目内容
解方程.
x-
=
;
x+
=1;
+x=
;
x+
=
.
x-
4 |
15 |
7 |
15 |
x+
13 |
21 |
5 |
10 |
13 |
10 |
x+
3 |
7 |
6 |
7 |
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,方程两边同时减
求解,
(4)依据等式的性质,方程两边同时减
求解.
4 |
15 |
(2)依据等式的性质,方程两边同时减
13 |
21 |
(3)依据等式的性质,方程两边同时减
5 |
10 |
(4)依据等式的性质,方程两边同时减
3 |
7 |
解答:解:(1)x-
=
,
x-
+
=
+
,
x=
;
(2)x+
=1,
x+
-
=1-
,
x=
;
(3)
+x=
,
+x-
=
-
,
x=
;
(4)x+
=
,
x+
-
=
-
,
x=
.
4 |
15 |
7 |
15 |
x-
4 |
15 |
4 |
15 |
7 |
15 |
4 |
15 |
x=
11 |
15 |
(2)x+
13 |
21 |
x+
13 |
21 |
13 |
21 |
13 |
21 |
x=
8 |
21 |
(3)
5 |
10 |
13 |
10 |
5 |
10 |
5 |
10 |
13 |
10 |
5 |
10 |
x=
4 |
5 |
(4)x+
3 |
7 |
6 |
7 |
x+
3 |
7 |
3 |
7 |
6 |
7 |
3 |
7 |
x=
3 |
7 |
点评:本题主要考查学生依据等式的性质解方程的能力,解方程时注意对齐等号.
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