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