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[tex]d_{Cu}=8,96 \ \frac{g}{cm^3}=8,96\cdot1000 \ \frac{kg}{m^3}=8960 \ \frac{kg}{m^3}\\\\V=0,09 \ m^3\\\\m=d\cdot V=8960 \ \frac{kg}{m^3}\cdot0,09 \ m^3=\boxed{806,4 \ kg}[/tex]
