a/ \(D=\dfrac{m}{V}=\dfrac{0,7236}{0,000268}=2700\left(kg\backslash m^3\right)\)
b/ \(V_1=\dfrac{m}{D}=\dfrac{0,6516}{2700}=2,08.10^{-4}\left(m^3\right)\)
\(V_r=V-V_1=6.10^{-5}\left(m^3\right)\)
tham khảo link bài làm
https://hoidap247.com/cau-hoi/185507