x2 + y2 = 2x x2 + y2 = 4x y = x
y = 0

(x2 + y2)zdxdydz V : x2 + y2 + |z| d" 1
V
z = x2 + y2 z = 2x2 + 2y2 y = x y = x3
y2 + z2 = a2 x + y = 0 x - y = 0
x2 + y2 = -z + 1 z = 0
x e" 0 y e" 0
y2 = 10x + 25 y2 = -6x + 9

xyzdxdydz V : |x| + |y| + |z| d" 1
V
x2 + z2 = a2 x + y = -a x + y = a
x - y = -a x - y = a a > 0
x2 + y2 = z2 Oxy
"
1
z = 2( x + 1)
2
x2 + y2 + z2 = R2
x e" 0 y e" 0 z e" 0