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\left(\frac{2}{7}l-\frac{1}{4}m\right)^{2}
Multiplica \frac{2}{7}l-\frac{1}{4}m y \frac{2}{7}l-\frac{1}{4}m para obtener \left(\frac{2}{7}l-\frac{1}{4}m\right)^{2}.
\frac{4}{49}l^{2}-\frac{1}{7}lm+\frac{1}{16}m^{2}
Utilice el teorema binomial \left(a-b\right)^{2}=a^{2}-2ab+b^{2} para expandir \left(\frac{2}{7}l-\frac{1}{4}m\right)^{2}.
\left(\frac{2}{7}l-\frac{1}{4}m\right)^{2}
Multiplica \frac{2}{7}l-\frac{1}{4}m y \frac{2}{7}l-\frac{1}{4}m para obtener \left(\frac{2}{7}l-\frac{1}{4}m\right)^{2}.
\frac{4}{49}l^{2}-\frac{1}{7}lm+\frac{1}{16}m^{2}
Utilice el teorema binomial \left(a-b\right)^{2}=a^{2}-2ab+b^{2} para expandir \left(\frac{2}{7}l-\frac{1}{4}m\right)^{2}.