plik


ÿþ 2 1 fn(x, y) = x + IA(x, y). ny 9IA, fn(x, y) -’! x2IA. 2 2 3-x 1 lim x + l2(dxdy) = x2 l2(dxdy) = x2dydx n’!" ny A 1 1 A 2 11 = (2x2 - x3)dx = . 12 1 x+y n fn(x, y) = 1 + xIA. 5 2xIA xIA n 2 x+1 x + y lim 1 + x l2(dxdy) = x l2(dxdy) = xdydx n’!" 5 A 1 x-1 A 2 = 2xdx = 3. 1 n x2+y2 fn(x, y) = IA (x, y). fn n 2 A = (-1, 1)× (-1, 1) {fn} n x2 + y2 lim l2(dxdy) = 0. n’!" 2 An x+y fn(x, y, z) = (1 + )ne-x-y-zIA(x, y, z) n e-zIA. fn e-zIA n " 1 1-x x + y lim 1 + e-x-y-z l3(dxdydz) = e-z dydxdz n’!" n A 0 0 0 " 1 = e-z(1 - x) dxdz 0 0 " 1 1 = e-z dz = . 2 2 0 fn(x, y) = (1 - sinn(x + y))xy2IA g(x, y) = 2xy2IA " 1 x 2xy2 l2(dxdy) = 2xy2 dydx " A 0 - x 1 1 " " 2 4 8 = x (( x)3 - (- x)3)dx = x5/2 dx = < ". 3 3 21 0 0 l2- g(x, y) À x + y = + kÀ, k " Z 2 8 lim (1 - sinn(x + y))xy2 l2(dxdy) = g(x, y) l2(dxdy) = . n’!" 21 A A n gn(x, y) = x2 + y2 I(0,")(xy)IU(x, y) x2 + y2 d" 1 n+1 n x2 + y2 d" x2 + y2 n n+1 x2 + y2 d" x2 + y2 limn’!" gn(x, y) = I(0,")(xy)IU(x, y). hn(x, y) = (1 - x2 - y2)nI(-",0](xy)IU(x, y) h(x, y) = I(-",0](xy)IU(x, y), limn’!" hn(x, y) = I{(0,0)}. lim fn(x, y)l2(dxdy) = I(0,")(xy) + I(-",0](xy) l(dx)l(dy) n’!" U U = I(0,")(xy) l(dx)l(dy). U T : (r, ±) ’! (r cos ±, r sin ±). T À 3 (0, 1)×((0, )*"(À, À)) K(0, 1))"{(x, y); xy > 0}, 2 2 |DT(r, ±)| = r. 1 À/2 1 3À/2 I(0,")(xy) l(dx)l(dy) = r d±dr + r d±dr U 0 0 0 À 1 À = À r dr = . 2 0 x y2 g(x, y, z) = xyz exp{- - - z}IS(x, y, z). 2 4 " " " x y2 g(x, y, z)l3(dxdydz) = xyz exp{- - - z} dydxdz 2 4 S 0 0 0 " " x = 2xz exp{- - z} dxdz 2 0 0 " = 8ze-z dz = 8. 0 xyz x y2 lim n sin exp - - - z l3(dxdydz) = 0. n’!" n2 2 4 S

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