79 361 



S = n — 1 



^^' ^ 125+ 1) ^»+1^"-» = ^«+»- 



s = 

 s = n 



s = 1 

 s = n — 1 



X , (2s) ^'^"~* ^ ^" — ''•^"" 



s= I 



s = n-- l 



94. ^ (2") 2''ß^ßn-s = £„-2(22" -l)ß„. ■ 



S = ft — 1 



95. ^(2")2''ßs£„-s = (2n+l)£„-(22"-l)(22" + 2)ß„. 



5 = 1 



S = 71 — 1 



*96. ^ (^V ^ ) ^' ^"-' = ^n - ^« ■ 



s = 1 



S = 11 — 1 



97. ^ {^""-^^V-E.Tn s = (22n-i-2)r„. 



5 = 1 



s = n — 1 



*93. 



s= I 

 s = n— 1 



s = l 

 s= ;i— 1 



s = 1 

 s = n— 1 



*99. V (2^) £,£„_, = r„+i - 2Ê„ 



7. Formules de seconde espèce. 



s = 1 



102. T. ^ (4n-i)(^;;z?) v-2 •J'ifcl) (^-'!r^) ^^""^^^^ß- 



s = l 



104. (n+>..- (^y(2--2)ß„£„+2'"(2;)('"ir>^^«^^-. 



