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Dada as matrizes:
A)
1 2 3
-4 5 6
4 6 8
B)
-7 -8 9
12 6 5
8 7 4
C)
2 3 -4
6 7 1
2 8 7
Determine
A) a+b
B) b+c
C)b-a
D)c-b