(1)()n(k)(k=1,2,3,,nk(k=1,2,3,,()〔红曲 Q/〔红曲k)((d.f(x,y)()爲j]7U,咖 bl:口)f(x,y),f(x,y)d,()f(x,二重积分的概念及性质z=f(x,y)()Sf运“Muk-1片〔"泗 b 烈皆屁皿 M%f(x,y)z=f(x,y)f(x,y)()(1).^(x,y)dc>=AJj7〔x,y)d(y®)(2).JJ7i(%x)£a■士j]72(x,x)£b⑶•()(J(2),()(J(2),j]7〔x,X)db=\\f(^y)dcr+^f(x,y)da-S 冷)S)⑷.()f(x,y)(x,y),JJ7〔"dbJJ炎,$两⑸•f(x,y)(),()(,),()-二重积分的计算法x(1).()yyxy()y")y2(x).x()ab.⑵•()xxyx()~(y)X2(y)・y()cd.⑶.()⑷.()yxyxO,R-j2R,JJJ'S 巧悶衣&=fJ爲,(A巧皿虫白O,R,2JJ73®MBB=rf㈤了〔屁㊉也O,R1JJ73&)用 wfs&)悶嗣u=f(x,yxf(x,y,z)(V)(V)n(V),(V),(V),,(V),V(k=1,2,,n).+0+0x+y+z=1xOyz,()(X,y),P(,Z)z=0z=1-x-yzx0y0x+y1),P(,,z)P,(,,Z)P.zzz=z界〔"诃=\i总鸞::囂环〔呻迢丹 inH② 妙遊 B