V=П∫y^2(x)dx
[tex]\pi \int\limits^4_0 {(4-x)} \, dx =\pi (4 х-x^{2} /2)\left \{ {{x=4} \atop {x=0}} \right. =\\=\pi (4*4-4*4/2)=8П[/tex]
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V=П∫y^2(x)dx
[tex]\pi \int\limits^4_0 {(4-x)} \, dx =\pi (4 х-x^{2} /2)\left \{ {{x=4} \atop {x=0}} \right. =\\=\pi (4*4-4*4/2)=8П[/tex]