8.1 曲面

1.

(a) $8x + 8y - z = 12$(b) $8x - 10y + 6z = -9$(c) $z = 0$

2.

(a) $\sqrt{4(u^2 + v^2) + 1}dudv$(b) $\sqrt{u^2 + 4}dudv$

(c) $${\frac{1}{\sqrt{1 - x^2 - y^2}}dx dy}$$(d) $${\frac{1}{F_{z}}\sqrt{F_{x}^2 + F_{y}^2 + F_{z}^2} dxdy}$$