№1.12. Build the surface and determine their type a) 6x2 - y2 + 3z2 - 12 = 0; b) 8y2 + 2z2 = x.
№2.12. Write the equation and determine the type of surface obtained by rotating this line around the specified axis of coordinates, make a picture: a) 5x2 - 6z2 = 30; Ox; b) x = 3; z = - 2; Oy.
№ 3.12. Build a body bounded by the specified surfaces: a) y = x; y = 0; x = 1; ...; z = 0.
b) ...; ...; z = 0; x + z = 2.