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a^{2}+\frac{4}{5}a+\frac{4}{25}
Usar teorema binomial \left(p+q\right)^{2}=p^{2}+2pq+q^{2} para expandir \left(a+\frac{2}{5}\right)^{2}.
a^{2}+\frac{4}{5}a+\frac{4}{25}
Usar teorema binomial \left(p+q\right)^{2}=p^{2}+2pq+q^{2} para expandir \left(a+\frac{2}{5}\right)^{2}.