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\frac{16807}{243}\left(-\frac{9}{49}\right)^{3}\left(-7\right)^{2}
Calcula \frac{3}{7} á potencia de -5 e obtén \frac{16807}{243}.
\frac{16807}{243}\left(-\frac{729}{117649}\right)\left(-7\right)^{2}
Calcula -\frac{9}{49} á potencia de 3 e obtén -\frac{729}{117649}.
-\frac{3}{7}\left(-7\right)^{2}
Multiplica \frac{16807}{243} e -\frac{729}{117649} para obter -\frac{3}{7}.
-\frac{3}{7}\times 49
Calcula -7 á potencia de 2 e obtén 49.
-21
Multiplica -\frac{3}{7} e 49 para obter -21.