A 
[[1,3,5]
 [2,4,6]
 [3,5,7]]
 B 
[[0,-3,-6]
 [1,-2,-5]
 [2,-1,-4]]
 A+B 
[[1,0,-1]
 [3,2,1]
 [5,4,3]]
 max A : 7
 max B : 2
 max abs(B) : 6
 max A+B : 5
 sum(A) 36
 prod(A) 75600