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alt exercitiu de matematica
danny
post Jan 27 2010, 02:24 PM
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Se spune ca inginerii au nevoie de 3 minute pt rezolvarea acestui test, arhitectii de 3 ore si doctorii de 6 ore. Ghiciti care este cel de-al 6-lea numar .

Care este al saselea numar: 1; 2; 6; 42; 1806; ....?
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study_nature
post Jan 27 2010, 02:34 PM
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QUOTE (danny @ Jan 27 2010, 04:24 PM) *
Se spune ca inginerii au nevoie de 3 minute pt rezolvarea acestui test, arhitectii de 3 ore si doctorii de 6 ore. Ghiciti care este cel de-al 6-lea numar .

Care este al saselea numar: 1; 2; 6; 42; 1806; ....?


Aproape ca fac parte din una dintre categorii, dar am reusit sa infirm cu mult ce se spune. biggrin.gif


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-- Thomas Jefferson, letter to his nephew Peter Carr, from Paris, August 10, 1787; Merrill D. Peterson, ed., Thomas Jefferson: Writings, New York: Library of America, 1994, pp. 900-906.
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santaklaus
post Jan 27 2010, 02:50 PM
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QUOTE (danny @ Jan 27 2010, 09:24 AM) *
Se spune ca inginerii au nevoie de 3 minute pt rezolvarea acestui test, arhitectii de 3 ore si doctorii de 6 ore. Ghiciti care este cel de-al 6-lea numar .

Care este al saselea numar: 1; 2; 6; 42; 1806; ....?

5 sec.
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danny
post Jan 27 2010, 02:53 PM
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felicitari pt cele 5 sec ! mie mi-au fost necesare vreo 30 sec. Problema o primisem pe mail , avea si un fisier atasat cu parola , rezultatul deschidea fisierul , dar am sters mailul si nu mai am fisierul.
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Ianis
post Jan 27 2010, 03:01 PM
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da, si eu tot in maxim 30 de secunde...de fapt regula am vazut-o din primele 10...calculul a fost cel consumator de timp.

De unde tot scoti testele astea?


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eretik
post Jan 27 2010, 03:38 PM
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10 sec.


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"...But you won't listen to reason. It's like playing Chess with a pigeon; no matter how good I am at chess, the pigeon is just going to knock over the pieces, crap on the board and strut around like it's victorious."
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danny
post Jan 27 2010, 03:41 PM
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QUOTE
De unde tot scoti testele astea?

Poate nu ai observat dar e primul test postat de mine , celalalte sunt postate de alt user. Eu l-am primit pe amil , inca mai am raspunsul care i l-am dat respectivului (cu rezultatul ) , mailul initial stergandu-l intre timp .
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myosotis
post Jan 27 2010, 05:13 PM
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"io in 5", "io in 10", "io doar in 30 dry.gif "

Concluzia: Domnilor, sunteti niste secundari! biggrin.gif


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kla
post Jan 27 2010, 05:17 PM
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In general graba nu este o virtute specific masculina...! wink.gif
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Bushman
post Jan 27 2010, 05:35 PM
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QUOTE (eretik @ Jan 27 2010, 04:38 PM) *
10 sec.


Iar mi-ai luat-o inainte dash2.gif 17 secunde.


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eretik
post Jan 27 2010, 05:42 PM
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Pai am terminat informatica, macar aci sa fiu si io bun, la functii.


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"...But you won't listen to reason. It's like playing Chess with a pigeon; no matter how good I am at chess, the pigeon is just going to knock over the pieces, crap on the board and strut around like it's victorious."
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polihronu
post Jan 27 2010, 06:29 PM
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Astia cu 5, cu 10 secunde: vreau sa stiu si eu - va ocupati cu mathemagics? smile.gif Ca una e sa ghicesti functia, alta sa o si rezolvi. Curiozitatea mea este reala si onesta - chiar vreau sa stiu daca vreunul dintre voi face calcule mentale cu viteza (pe modelul lui Arthur Benjamin).


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santaklaus
post Jan 27 2010, 06:45 PM
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QUOTE (polihronu @ Jan 27 2010, 01:29 PM) *
Astia cu 5, cu 10 secunde: vreau sa stiu si eu - va ocupati cu mathemagics? smile.gif Ca una e sa ghicesti functia, alta sa o si rezolvi. Curiozitatea mea este reala si onesta - chiar vreau sa stiu daca vreunul dintre voi face calcule mentale cu viteza (pe modelul lui Arthur Benjamin).

Nu sunt informatician, dar am facut cu fata mea astfel de chestii recent si am observat imediat "cheia". 5 sec mi-a luat sa calculez pe calculator rolleyes.gif
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polihronu
post Jan 27 2010, 06:57 PM
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QUOTE (santaklaus @ Jan 27 2010, 08:45 PM) *
Nu sunt informatician, dar am facut cu fata mea astfel de chestii recent si am observat imediat "cheia". 5 sec mi-a luat sa calculez pe calculator rolleyes.gif

Ere, la fel?


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eretik
post Jan 27 2010, 07:06 PM
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Da, e vorba de stabilirea foarte rapida a unei relatii intre numere.
Incerci sa le imparti intre ele pe cele consecutive, etc.
La asta am observat ca rezultatul impartirii era exact numarul la care imparteam + 1.
Deci x1=x0 patrat + x0.


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"...But you won't listen to reason. It's like playing Chess with a pigeon; no matter how good I am at chess, the pigeon is just going to knock over the pieces, crap on the board and strut around like it's victorious."
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kla
post Jan 27 2010, 07:11 PM
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sau daca se da factor comun X0 in partea dreapta:
X1=X0(X0+1)
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polihronu
post Jan 27 2010, 07:17 PM
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Din nou, stiu din experienta ca nu-ti trebuie 3 minute sa vezi functia. Dar ati facut si produsul care sa rezolve intrebarea in timpul pe care l-ati indicat?


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eretik
post Jan 27 2010, 07:23 PM
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Da, cu calculatorul. Pai asta a fost primul lucru.


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"...But you won't listen to reason. It's like playing Chess with a pigeon; no matter how good I am at chess, the pigeon is just going to knock over the pieces, crap on the board and strut around like it's victorious."
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myosotis
post Jan 27 2010, 07:23 PM
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QUOTE (polihronu @ Jan 27 2010, 08:17 PM) *
Din nou, stiu din experienta ca nu-ti trebuie 3 minute sa vezi functia. Dar ati facut si produsul care sa rezolve intrebarea in timpul pe care l-ati indicat?


Poli, un lucru stiu sa-ti spun, eu la X si 0 ma pricep, dar la ce faceti voi aici, defel. smile.gif Putem redenumi topicul asta mathe-macho club smile.gif

worthy.gif pentru toti "secundarii" smile.gif


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kla
post Jan 27 2010, 07:25 PM
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Pai e foarte simplu. Nu trebuia decat o inmultire (42*43).
Se poate utiliza de exemplu metoda chinezeasca (insa dureaza mai mult de 5 secunde).
Detalii la http://www.youtube.com/watch?v=DEp9e2lpwnk
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