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4.29. £ хп . 4.30. V хл !.<br />

я * 1 п —1<br />

5. Найти область сходимости ряда и его сумму.<br />

°° л<br />

00 2л+1<br />

5.1. V -<br />

5.2. V — ^<br />

л(л + 1)<br />

Г2л (2л + 1 )(2л+ 2)<br />

л = 1<br />

л = 0<br />

00<br />

5.3. У (- 1 )" -1 Xл + 1 00 2 л - 1<br />

5.4.<br />

л(л + 1)<br />

2л(2л- 1)<br />

л = 1<br />

QO<br />

л = 1<br />

Л = 1<br />

00 , 1Чл л+1<br />

5.6. у - Iz iliE ----.<br />

L i (л + 1 )(л + 2)<br />

л = О<br />

00 . л<br />

* г-п л+1<br />

5.7. У sm Х<br />

л (л - 1 )<br />

л(л+ 1)х<br />

л = 2 л = 1<br />

00 -пх<br />

5.10. £<br />

л = 1<br />

л = 1<br />

со 00 Л 2и+ 1<br />

5.11. у (-1 ) " - * ( ! + - L - V . 5.12. у ----<br />

Z j \п n + V Z-f 16я(2л+1)<br />

л = 1 л = 0<br />

5.13.<br />

” 1+(-1 )"~ 1 2л+1<br />

L , 2л+1<br />

л = О<br />

00 , , *л - 1 2л -1<br />

5.15. £ И ) - -?---<br />

4 (2 л- 1)<br />

л = 1<br />

5.17. у 1 ± Ы > > +1.<br />

Z-< 2л +1<br />

л = О<br />

5.14. f<br />

Л = 1<br />

00 , ,ч Л - 1 л<br />

5.16. У *-<br />

л (л- 1)<br />

л = 2<br />

* * I<br />

Л = 1<br />

л + 2<br />

х<br />

5.19. £ (-1)Я- 1( 1 4 > Л- 1. 5.20. £ j<br />

Л “ 1<br />

® t - ,чя+ л\п^ и Яп<br />

5.21. у t d D )--- ___ И.<br />

L-i л(л п(п + 1)<br />

л = 2<br />

со п<br />

5.22. £ *<br />

л ( л - 1 )<br />

л = 1 л = 2<br />

345

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