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a) 3 + 4 = 9 + 30= 39 se divide por3 39=13
5 3 15 15 15 5
b) 8 - 4= 16-12= 4= 2
3 2 6 6 3
c) 8 + 2 = 40 + 6= 46
3 5 15 15
d) 2 - 3 - 4= 30 - 30 -24 = -24 = -12
2 3 5 30 30 15