高数课程妥媒血课件 镭理工大理>> dInu lap aQ o ay ax f() (x)=e ∫/(x) b当只与有关时; o=mlu ar ay dy dInu 1,ag aP g(y) 小 P ar ay 1(y)=de(y) Http://www.heut.edu.cnb.当只与y有关时; ( ) ln 1 x Q y P dx Q d   −    =  = f (x) ( ) . ( )   = f x dx  x e = 0,   x  , dy d y   =   ( ) ln 1 y P x Q dy P d   −    =  = g( y) ( ) . ( )   = g y dy  y e