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Forum Studenti •inf - sup - max - min - Pagina 3
Pagina 3 di 4

Inviato: venerdì 22 gennaio 2010, 18:42
da m.moscadelli

Inviato: venerdì 22 gennaio 2010, 18:44
da selly

allora ho risolto {|6n-9|+|6n-11|: n∈N } ho trovato n=5/3 l'ho sostituito nella funzione e il risultato è 2 cioè il risultato dell'esercizio successivo: {|6x-9|+|6x-11|: x∈R }. COSA CAMBIA???? nn riesco davvero a capirlo!!! HELPPPP

Inviato: venerdì 22 gennaio 2010, 18:47
da m.moscadelli
mi disp ma quelli non so proprio come prenderli :(

Inviato: venerdì 22 gennaio 2010, 18:47
da selly

Inviato: venerdì 22 gennaio 2010, 18:48
da selly

Inviato: venerdì 22 gennaio 2010, 18:49
da selly

Inviato: venerdì 22 gennaio 2010, 18:50
da selly

Inviato: venerdì 22 gennaio 2010, 19:06
da selly
sempre in inf-max-min.inf 2
{e^(1/x): x∈(-1,0) }
come sup trovo 1/e, OK
ma come inf???? il libro dice 0....si ma da dove gli viene fuori sto 0...cioè da che x??
poi:
{e^(1/x): x∈R\{0}}ha come inf 0 e come sup +inf....ma da che x vengono fuori?????
:wink:

Inviato: venerdì 22 gennaio 2010, 19:20
da g.masullo

Inviato: venerdì 22 gennaio 2010, 19:23
da selly
ops...è tutto il giorno che sn tra max e min e alla fine nn capivo più niente ahahahhahah grazie mille hai ragione !!! ahahhahahhahaha
come ti è andato poi l'orale di analisi???

Inviato: venerdì 22 gennaio 2010, 19:26
da g.masullo
Lasciamo stare va..

Mi sono "ca'ato sotto" e manco le tabelline sapevo piu'..

Alla fine come si dice da noi a roma: 18 e un calcio in cu*o

Inviato: venerdì 22 gennaio 2010, 19:34
da selly
cavolooo io ti ammiroooo !!! pur di passarlo nn sò cosa farei...ho avuto tutta la settimana la febbre a 38 e mezzo e nn ce la faccio più per di più non solo quel tutti gli annessi e connessi....spero di passarlooo!!!
GRANDEEEE!!!
se posso chiederti anke(inf,sup,max,min)):
{e^(1/x): x∈(-1,0) }
come sup trovo 1/e, OK
ma come inf???? il libro dice 0....si ma da dove gli viene fuori sto 0...cioè da che x??
poi:
{e^(1/x): x∈R\{0}}ha come inf 0 e come sup +inf....ma da che x vengono fuori?????
e questo:
{|n-pigreco|: n∈N} come si risolvono??

Inviato: venerdì 22 gennaio 2010, 21:09
da g.masullo
ihihih Io forse invece mi devo operare alla mano XD

Comunque...
Devi solo pensare al grafico di e^1/x.. come è fatto?

Pensa ai limiti.. +oo per x->0, 0 per x->+oo.. quindi sara' una cosa decrescente no??


E allora a occhio vedi.. che il sup è +oo e l inf è 0... in quanto l inf è "quello che vorrebbe essere il min" e il sup "quello che vorrebbe essere il max".


Per quanto riguarda l ultima funzione, il sup dovrebbe essere +00, l inf e il min 3, e il max N.E.

Sbaglio?

Inviato: venerdì 22 gennaio 2010, 21:29
da m.moscadelli
e^(1/x) "parte" da 0 e tende a 1 [da sotto] per x->-oo; equivale per x->+oo però da sopra (quindi ha asintoto orizzontale y=1)...e a x->0 va a +oo

Inviato: sabato 23 gennaio 2010, 10:40
da selly
per questa
{e^(1/x): x∈(-1,0) }
il libro da INF=0, SUP=+oo e (min e max)=N.E
la cosa che non capisco è perchè inf è =0...(dato che si parla di una Y)

per questa
{e^(1/x): x∈R\{0}}
il libro da INF=0, SUP=+oo e (min e max)=N.E

infine queste non riescono a nessuno??? {|n-pigreco|: n∈N}, {|n-1|>|2n-8| : n∈N},
{m∈M: 2^m<=m+10}.