5-
6
15-
7x3
(
4x3+
15)
:
20
10-
9
(
x2+
8)
:
3x8
20-
8
11-
9:
6
2-
9
x3:
9x4+
9
(
7-
6)
3
9-
5x5+
3x5
(
9-
7)
5
8:
6x5+
8
(
4-
6)
24
x3-
8x5
(
21-
x2)
7
6x3+
30
12:
x4
4x4-
15
5x7:
4x6
5-
42
(
12+
30)
1
8-
3x8
(
13-
15)
4
x4:
20x5
6x5-
5
(
3-
3x4)
13
20:
20
7x3-
x2
6-
4
