A has 9 non-zero entries:
1: (1, 1.0) (2, 2.0) (3, 3.0) 
2: (1, 4.0) (2, 5.0) (3, 6.0) 
3: (1, 7.0) (2, 8.0) (3, 9.0) 

B has 5 non-zero entries:
1: (1, 1.0) (3, 1.0) 
3: (1, 1.0) (2, 1.0) (3, 1.0) 

(1.5)*A =
1: (1, 1.5) (2, 3.0) (3, 4.5) 
2: (1, 6.0) (2, 7.5) (3, 9.0) 
3: (1, 10.5) (2, 12.0) (3, 13.5) 

A+B =
1: (1, 2.0) (2, 2.0) (3, 4.0) 
2: (1, 4.0) (2, 5.0) (3, 6.0) 
3: (1, 8.0) (2, 9.0) (3, 10.0) 

A+A =
1: (1, 2.0) (2, 4.0) (3, 6.0) 
2: (1, 8.0) (2, 10.0) (3, 12.0) 
3: (1, 14.0) (2, 16.0) (3, 18.0) 

B-A =
1: (2, -2.0) (3, -2.0) 
2: (1, -4.0) (2, -5.0) (3, -6.0) 
3: (1, -6.0) (2, -7.0) (3, -8.0) 

A-A =

Transpose(A) =
1: (1, 1.0) (2, 4.0) (3, 7.0) 
2: (1, 2.0) (2, 5.0) (3, 8.0) 
3: (1, 3.0) (2, 6.0) (3, 9.0) 

A*B =
1: (1, 4.0) (2, 3.0) (3, 4.0) 
2: (1, 10.0) (2, 6.0) (3, 10.0) 
3: (1, 16.0) (2, 9.0) (3, 16.0) 

B*B =
1: (1, 2.0) (2, 1.0) (3, 2.0) 
3: (1, 2.0) (2, 1.0) (3, 2.0)