5x4.2x3
3x4+2x4
5x4
10x7
x9:x8
2x4 . 5x
10x5-8x5
4x3:2x3
2x3
2
4x3-2x3
7x6
28x4
6x2-4x2
5x6+2x6
x
2x5
2x2
10x5
4x.7x3
