Respostas

2014-02-04T18:14:13-02:00
 a)A={x ∈ z l  = 9} 
S = {-3,+3}
b)B={x ∈ z l  ≥ 0}
S = {0,1,4,9,16,25 ...}
c) C={x ∈ z l  = 0}
S = {0}
d) D={x ∈ z l 56 < x ≤ 118}
S = {57,58,59,60,61 ... 113,114,115,116,117}

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