问题 解答题
解方程.
1
2
+x=1
x-
3
7
=
1
2
x+
2
3
=
7
6
x+
2
9
=
2
3
x-
3
8
=
7
12
5
24
+x=
2
3
答案

(1)

1
2
+x=1,

1
2
+x-
1
2
=1-
1
2

x=

1
2

(2)x-

3
7
=
1
2

x-

3
7
+
3
7
=
1
2
+
3
7

x=

13
14

(3)x+

2
3
=
7
6

x+

2
3
-
2
3
=
7
6
-
2
3

x=

1
2

(4)x+

2
9
=
2
3

x+

2
9
-
2
9
=
2
3
-
2
9

x=

4
9

(5)x-

3
8
=
7
12

x-

3
8
+
3
8
=
7
12
+
3
8

x=

23
24

(6)

5
24
+x=
2
3

5
24
+x-
5
24
=
2
3
-
5
24

x=

11
24

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