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