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0.64x^{2}+0.8xy+0.25y^{2}
Usar teorema binomial \left(a-b\right)^{2}=a^{2}-2ab+b^{2} para expandir \left(-0.8x-0.5y\right)^{2}.
0.64x^{2}+0.8xy+0.25y^{2}
Usar teorema binomial \left(a-b\right)^{2}=a^{2}-2ab+b^{2} para expandir \left(-0.8x-0.5y\right)^{2}.