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\left(\frac{1}{7}-y\right)^{2}
Multipliqueu \frac{1}{7}-y per \frac{1}{7}-y per obtenir \left(\frac{1}{7}-y\right)^{2}.
\frac{1}{49}-\frac{2}{7}y+y^{2}
Utilitzeu el teorema del binomi \left(a-b\right)^{2}=a^{2}-2ab+b^{2} per desenvolupar \left(\frac{1}{7}-y\right)^{2}.
\left(\frac{1}{7}-y\right)^{2}
Multipliqueu \frac{1}{7}-y per \frac{1}{7}-y per obtenir \left(\frac{1}{7}-y\right)^{2}.
\frac{1}{49}-\frac{2}{7}y+y^{2}
Utilitzeu el teorema del binomi \left(a-b\right)^{2}=a^{2}-2ab+b^{2} per desenvolupar \left(\frac{1}{7}-y\right)^{2}.