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\left(\frac{2}{7}\right)^{-2}a^{-2}
Expanda \left(\frac{2}{7}a\right)^{-2}.
\frac{49}{4}a^{-2}
Calcule \frac{2}{7} elevado a -2 e obtenha \frac{49}{4}.
\left(\frac{2}{7}\right)^{-2}a^{-2}
Expanda \left(\frac{2}{7}a\right)^{-2}.
\frac{49}{4}a^{-2}
Calcule \frac{2}{7} elevado a -2 e obtenha \frac{49}{4}.