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Forum Studenti •Limiti 3 - 6° prima fila
Pagina 1 di 1

Limiti 3 - 6° prima fila

Inviato: venerdì 12 novembre 2010, 18:32
da zartom
(3n su n) - (2n su n); non riesco a risolverlo con i criteri di radice, rapporto o rapporto-radice. Dimostrando che (3n su n)>(2n su n) riesco a dire che tutto tende a +inf, ma non riesco ad applicare i criteri.

Inviato: sabato 13 novembre 2010, 22:55
da isotta
raccogli a fattor comune o (3n su n) o (2n su n)..
sviluppa i calcoli e dopo vedrai riuscirai ad applicare qualche criterio :-)

Re: Limiti 3 - 6° prima fila

Inviato: domenica 14 novembre 2010, 10:05
da Massimo Gobbino

Inviato: martedì 30 novembre 2010, 17:46
da dakron9

Inviato: martedì 30 novembre 2010, 22:11
da CoTareg

Inviato: mercoledì 1 dicembre 2010, 15:26
da dakron9
THANKS!!!!
stasera appena torno a casa ci provo :)...

il piccolo problemino è che stavo già tentanto la strada dei raccoglimenti, ma l'espressione si ingrandiva parecchio, per questo ho pensato che forse c'era un metodo più "veloce"...

ti faccio sapere piu tardi...

grazie ancora! :D

Inviato: domenica 12 dicembre 2010, 23:47
da dakron9
Finalmente sono arrivato a una conclusione!!!! su consiglio di isotta e CoTareg ho raccolto un binomiale (il primo) e ho svolto i relativi passaggi..

poi ho deciso di usare il limite del rapporto ma purtroppo è scoppiato l'inferno!!! e fino a oggi ho lasciato in sospeso quel limite :(

poi l'illuminazione: "perchè non guardare nei pdf degli anni passati?"... non ho trovato la soluzione, ma ho trovato il modo giusto di procedere(per la precisione il pdf è il numero 3 del ricevimento analisi 2008/09):

quando applico il rapporto NON devo applicarlo a tutta l'espressione (ed è per questo che mi sono arreso) ma solo a un pezzo, cioè quello dentro le parentesi (e quello fuori naturalmente, per non rischiare di fare un limite metà per volta... correggetemi se sbaglio!)..

FATTO!!!