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169+26a+a^{2}
Usar teorema binomial \left(p+q\right)^{2}=p^{2}+2pq+q^{2} para expandir \left(13+a\right)^{2}.
169+26a+a^{2}
Usar teorema binomial \left(p+q\right)^{2}=p^{2}+2pq+q^{2} para expandir \left(13+a\right)^{2}.