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144x^{2}-7.2xy+0.09y^{2}
Usar teorema binomial \left(a-b\right)^{2}=a^{2}-2ab+b^{2} para expandir \left(12x-0.3y\right)^{2}.
144x^{2}-7.2xy+0.09y^{2}
Usar teorema binomial \left(a-b\right)^{2}=a^{2}-2ab+b^{2} para expandir \left(12x-0.3y\right)^{2}.