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0.81a^{2}+0.18a+0.01
Usar teorema binomial \left(p-q\right)^{2}=p^{2}-2pq+q^{2} para expandir \left(-0.9a-0.1\right)^{2}.
0.81a^{2}+0.18a+0.01
Usar teorema binomial \left(p-q\right)^{2}=p^{2}-2pq+q^{2} para expandir \left(-0.9a-0.1\right)^{2}.