a67 



Pjo'.iij./.ig. I'integrale (leja'dx f^-ra -^ — lifes fera - — 

 P.i^>-. 130. / I . Problime II. lifcs Problems XL 



Pag.i^^hi. £B = P'-h(^ lifesB-B' = P-r(^ 



«J 



A 



