3.4()=- (g≠0) g 4.d= 中y If(y)小 f"(x) 5.∫(g(x)=f(u)g(x)dx2 3. ( ) f d g  (g  0) 2 gdf fdg g  4. ( ) dy dx f x   1 [ ( )] f y dy    5. [ ( ( ))] d f g x  f u g x dx   ( ) ( )