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-8\sqrt{\left(-4\right)^{2}}+\sqrt[3]{\left(-4\right)^{3}}\left(-\frac{1}{2}\right)^{2}-\sqrt[3]{21}
Calcule -2 elevado a 3 e obtenha -8.
-8\sqrt{16}+\sqrt[3]{\left(-4\right)^{3}}\left(-\frac{1}{2}\right)^{2}-\sqrt[3]{21}
Calcule -4 elevado a 2 e obtenha 16.
-8\times 4+\sqrt[3]{\left(-4\right)^{3}}\left(-\frac{1}{2}\right)^{2}-\sqrt[3]{21}
Calcule a raiz quadrada de 16 e obtenha 4.
-32+\sqrt[3]{\left(-4\right)^{3}}\left(-\frac{1}{2}\right)^{2}-\sqrt[3]{21}
Multiplique -8 e 4 para obter -32.
-32+\sqrt[3]{-64}\left(-\frac{1}{2}\right)^{2}-\sqrt[3]{21}
Calcule -4 elevado a 3 e obtenha -64.
-32-4\left(-\frac{1}{2}\right)^{2}-\sqrt[3]{21}
Calcule \sqrt[3]{-64} e obtenha -4.
-32-4\times \frac{1}{4}-\sqrt[3]{21}
Calcule -\frac{1}{2} elevado a 2 e obtenha \frac{1}{4}.
-32-1-\sqrt[3]{21}
Multiplique -4 e \frac{1}{4} para obter -1.
-33-\sqrt[3]{21}
Subtraia 1 de -32 para obter -33.