问题 解答题
解方程.
x+
2
5
=
7
10

5
6
+x=
7
8

x-
2
9
=
11
12

x-
3
4
=
5
8
答案

(1)x+

2
5
=
7
10

x+

2
5
-
2
5
=
7
10
-
2
5

x=

3
10

(2)

5
6
+x=
7
8

5
6
+x-
5
6
=
7
8
-
5
6

x=

1
24

(3)x-

2
9
=
11
12

x-

2
9
+
2
9
=
11
12
+
2
9

x=

41
36

(4)x-

3
4
=
5
8

x-

3
4
+
3
4
=
5
8
+
3
4

x=

11
8

多项选择题
单项选择题