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> Matematica dinainte de lucrare, Matematica face pagube din nou

iustin
post Feb 17 2008, 06:56 PM
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Deci trebuie sa recunosc ca a 11-a e cea mai grea clasa , in special inceputul semestrului al II-lea emo-tomato.gif .
Exercitiile care nu stiu cum sa le rezolva , dar care stiu cum sa le citesc don-t_mention.gif

1) Cazul 0/0:

lim (x*x-1)/ (x*x + 3x + 2) ; lim (x*x*x + 3*x*x - 9x + 5)/(x-1)(x-1) ; lim (X la puterea M -1)/(X la puterea N -1);
x->-1 _________________ x->1 __________________________ x->1

lim (x+x*x+ .... + X la N -N)/(x-1) ; lim |x|/x ; lim (x*x-2x) / |x| ;
x->1 ______________________ x->0 ___ x->0



Cazul 2 il scriu ...


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vesperala
post Feb 17 2008, 07:25 PM
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smile.gif seria de limite scris deja :

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iustin
post Feb 17 2008, 07:33 PM
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2) Cazul Infinit/Infinit ( o sa prescurtez infinit cu "oo" ) :

lim (-5*x*x*x + 6*x*x -3)/(2*x*x + 3x - 5) ; lim (2x+1)/(x*x*x-5x) ; lim [RADDIN(x*x+3x+1)]/ ( -2x+5 )
x->oo ____________________________ x->oo _____________ x->oo


lim (ln(x+1))/x , (ln(1+x) < x/(RADDIN(1+x)) ,x >0 ; lim (E la X + E la 2X)/(E la 2X + E la 3X)
x->oo _________________________________ x->oo


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vesperala
post Feb 17 2008, 07:53 PM
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QUOTE (iustin @ Feb 17 2008, 07:33 PM) *
(ln(1+x) < x/(RADDIN(1+x)) ,x >0

s neleg c trebuie demonstrat inegalitatea?


limitele sunt n ataament:
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vesperala
post Feb 17 2008, 08:17 PM
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m-am dumirit , se vrea calculul limitei 4 pe baza inegalitii, folosind criteriul cletelui

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amadino
post Feb 21 2008, 08:18 AM
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doamna profa de mate nu mai stie calcula? emo-rade.gif
glumeam emo-tongue.gif
ca daca nu zic asta te superi sad.gif
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Neo
post Feb 21 2008, 07:43 PM
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Aoleo, decand nu am mai facut eu astfel de matematica, am uitat tot ! sad.gif
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vesperala
post Feb 21 2008, 07:46 PM
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QUOTE (Neo @ Feb 21 2008, 07:43 PM) *
Aoleo, de cand nu am mai facut eu astfel de matematica, am uitat tot ! sad.gif

da...poate, dar dac ai avea nevoie i le-ai aminti uor..smile.gif


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Neo
post Feb 21 2008, 08:00 PM
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Nu cred, n-am mai facut matematica de cativa ani buni.
Mi-ar placea sa ma reapuc sa mai fac exercitii dar nu am cand.
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Alexa
post Mar 3 2008, 04:30 PM
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sry vesperala nu citisem tot mesajul smile.gif)
deci ... nu stiu cum sa rezolv integralele alea ...adica nu stiu cum sa desfac polinoamele alea de gradul 4 6 8 ...
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vesperala
post Mar 3 2008, 05:11 PM
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QUOTE (Alexa @ Mar 3 2008, 04:30 PM) *
sry vesperala nu citisem tot mesajul smile.gif)
deci ... nu stiu cum sa rezolv integralele alea ...adica nu stiu cum sa desfac polinoamele alea de gradul 4 6 8 ...

1.
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2.

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smile.gif baft


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Alexa
post Mar 3 2008, 05:37 PM
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saru'mana doamna profesoara give_heart.gif biggrin.gif


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vesperala
post Mar 3 2008, 05:39 PM
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QUOTE (Alexa @ Mar 3 2008, 05:37 PM) *
saru'mana doamna profesoara give_heart.gif biggrin.gif

emo-airkiss.gif cu plcere, sunt aici cnd mai ai dificulti.

emo-bienvenue.gif


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Aprig
post Mar 3 2008, 05:44 PM
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emo-stars.gif

tocmai mi-am dat seama c am uitat TOT!!!!!


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NightShift
post Mar 3 2008, 05:55 PM
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Si eu mi-am dat seama de acelasi lucru. emo-pardon.gif


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vesperala
post Mar 3 2008, 05:59 PM
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QUOTE (Aprig @ Mar 3 2008, 05:44 PM) *
emo-stars.gif

tocmai mi-am dat seama c am uitat TOT!!!!!

poate aa cei ce nva acum i vor da seama c trebuie meninut legtura permanet cu matematica, altfel chiar se uit.
iar tu tii unde sunt dac ai nevoie..smile.gif
QUOTE (NightShift @ Mar 3 2008, 05:55 PM) *
Si eu mi-am dat seama de acelasi lucru. emo-pardon.gif


m tot uit la titlu...face pagube sau victime oare? smile.gif


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Narcisa
post Mar 3 2008, 06:43 PM
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Eu stau mult mai bine cu matematica ...nu mai am ce uita si basta! emo-ang.gif


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Alexa
post Mar 5 2008, 05:57 PM
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doamna profesoara intrebare .... cum se face inversa unei functii f(x)? emo-uf.gif


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vesperala
post Mar 5 2008, 06:21 PM
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QUOTE (Alexa @ Mar 5 2008, 05:57 PM) *
doamna profesoara intrebare .... cum se face inversa unei functii f(x)? emo-uf.gif

depinde de funcie...smile.gif
important e s ai o funcie bijectiv...


fac f duce elementul x n y, inversa l va duce pe y n x...

se schimb rolurile ntre domeniul de definiie i codomeniu.

smile.gif
de ce am impresia c nu i trebuie inversa, ci derivata inversei ie..smile.gif poate m nel...

cert e c derivata inversei n punctul a se calculeaz cu formula:

(f-1)'(a)=1/f'(b), pentru numerele a, b legate prin relaia> f(b)=a

important este s l gseti pe b.


baft...


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Alexa
post Mar 5 2008, 06:29 PM
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trebuie sa fac inversa functiei f(x)=x patrat + x + 1....adica fla -1 (x)


si o am definita pe (0 infinit)

deci nu prea cred ca se rezolva cum ai zis tu...sau cel putin nu inteleg eu cum.....cu bijectivitate si bla bla altele emo-uf.gif


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