高数课程妥媒血课件 镭理工大理>> 00 v2()00 2dx ax Vi(y) ax d d 2(v2(), y)dy- 2(v,(), y)dy =l2(xyy-」c29(x,y)h VIlJ Q(x,y)dy+ 2(x, y)do CBE x=y2(y) o(, y)dy 丿L aP 同理可证 dxdy=k, P(x,y)dx Http://www.heut.edu.cndx xQ dxdy dy xQ yy dc D     =  ( ) ( ) 21    = − dc dc Q( ( y), y)dy Q( ( y), y)dy  2  1   = − CBE CAE Q(x, y)dy Q(x, y)dy   = + CBE EAC Q(x, y)dy Q(x, y)dy  = L Q ( x, y )dy 同理可证   =  − L D dxdy P x y dx yP ( , ) y x od ( ) 2 x =  y D c CE ( ) 1 x =  y