(1)
1 2 0 0 0
0 1 0 0 0
2 1 3 2 3
-2 0 2 3 -1
4 2 2 1 3
(2)
a^3 2*a^2 0 0
0 a^3 0 0
0 0 b^3 0
0 0 -2*b^2 b^3