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Forum Studenti •Max, min, inf, sup

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Max, min, inf, sup

https://pagine.dm.unipi.it/gobbino/Forum/Studenti/viewtopic.php?f=5&t=2000

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Max, min, inf, sup

Inviato: venerdì 20 ottobre 2017, 13:36
da trida
Ciao a tutti sono bloccato su questo esercizio, E={(x+y)log|x+y|} x=[-1,1) y=(-1,1] trovare max min, inf e sup :(

Re: Max, min, inf, sup

Inviato: venerdì 20 ottobre 2017, 22:11
da Valerio

Re: Max, min, inf, sup

Inviato: sabato 21 ottobre 2017, 0:05
da trida
Io ho provato a fare così :
1) Metto t=x+y quindi t avrebbe come punti di insieme (-2,2)
2) la funzione diventa tlog(t) che ha come inf -2log2 e sup 2log2 senza avere max e min.
Però non sono molto sicuro

Re: Max, min, inf, sup

Inviato: sabato 21 ottobre 2017, 11:05
da Valerio

Re: Max, min, inf, sup

Inviato: sabato 21 ottobre 2017, 11:14
da GIMUSI

Re: Max, min, inf, sup

Inviato: sabato 21 ottobre 2017, 11:23
da Valerio

Re: Max, min, inf, sup

Inviato: sabato 21 ottobre 2017, 13:25
da trida
Ok, grazie mille a tutti :)

Re: Max, min, inf, sup

Inviato: domenica 22 ottobre 2017, 0:27
da GIMUSI
allego un possibile svolgimento

Re: Max, min, inf, sup

Inviato: domenica 22 ottobre 2017, 11:31
da trida
Come mai ha dovuto trovare dei punti interni ?

Re: Max, min, inf, sup

Inviato: domenica 22 ottobre 2017, 11:38
da GIMUSI

Re: Max, min, inf, sup

Inviato: domenica 22 ottobre 2017, 13:06
da trida
Ok, grazie mille.
Per caso sul sito ci sono altri esercizi del gente per analisi 1 ?

Re: Max, min, inf, sup

Inviato: domenica 22 ottobre 2017, 13:48
da GIMUSI

Re: Max, min, inf, sup

Inviato: domenica 22 ottobre 2017, 18:53
da trida
Grazie mille :D

Re: Max, min, inf, sup

Inviato: domenica 22 ottobre 2017, 19:23
da GIMUSI
allego un secondo svolgimento più furbo secondo il metodo proposto qui da trida
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