问题 解答题
X+
7
20
x=
1
5
5
12
x+
5
6
x=150
10
13
x-
1
3
x=34
X-
5
9
x=
2
27
答案

(1)x+

7
20
x=
1
5

27
20
x=
1
5

27
20
x÷
27
20
=
1
5
÷
27
20

x=

4
27

(2)

5
12
x+
5
6
x=150,

15
12
x=150,

15
12
x÷
15
12
=150÷
15
12

x=120;

(3)

10
13
x-
1
3
x=34,

17
39
x=34,

17
39
x÷
17
39
=34÷
17
39

x=78;

(4)x-

5
9
x=
2
27

4
9
x=
2
27

4
9
x÷
4
9
=
2
27
÷
4
9

x=

1
6

单项选择题 A1/A2型题
判断题