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> Mai stiti aritmetica?

48ś2(9+3)=?
 
2 [ 57 ] ** [58.16%]
288 [ 33 ] ** [33.67%]
nu stiu [ 0 ] ** [0.00%]
e o greseala pe undeva [ 8 ] ** [8.16%]
Total Votes: 98
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iulian'71
post 17 Apr 2011, 21:02
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288 este rezultatul. Fii-miu e in clasa a 3-a si tocmai astfel de operatii face. Operatiile aritmetice se fac in ordine daca sunt de acelasi rang si au prioritate cele din paranteze si nu inmultirea in fata impartirii. Pentru cei ce au dubii pot oferi meditatii la mate si fizica contra cost desigur.
Rezolvarea: 48:2(9+3)=48:2(12)=48:2x12=24x12=288.


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tatabobu
post 18 Apr 2011, 09:24
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Muttley, n-am vrut sa pacalesc pe nimeni. Dar am asistat la o discutie lunga de tot pe forumul asta exact pe subiectul in cauza, in care insa foarte multi incearca sa convinga pe toata lumea ca au dreptate cand spun ca rezultatul corect e 2. Daca te uiti la rezultatul votului vezi ca-n momentul asta e 373 la 344 in favoarea lui 288.
Am facut topicul asta mai mult ca sa vad daca aici vine cineva cu o pagina de manual sau altceva care sa sustina ca rezultatul e 2 (dincolo raspunsurile au variat de la "asa stiu eu" la "asa face si nu-stiu-ce-program-de-calcule", dar nimeni n-a scos de la naftalina o lucrare acceptata in care sa existe regula dupa care a calculat cand i-a dat 2).


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Muttley
post 18 Apr 2011, 16:30
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Ce sa scoti de la naftalina, caietul de aritmetica din clasa I?
S-a spus deja, e ordine a operatiilor elementara.

Ce ma intriga pe mine e faptul ca pe de o parte (pentru mine cel putin) asta e "capcana" (eu am muscat-o), iar pe de alta parte pare-se a fi pe bune, cica sunt calculatoare de buzunar care dau 288, altele care dau 2.

O fi coincidenta.


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bucatzel
post 18 Apr 2011, 17:13
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QUOTE(tatabobu @ 18 Apr 2011, 10:24)
dar nimeni n-a scos de la naftalina o lucrare acceptata in care sa existe regula dupa care a calculat cand i-a dat 2).
*



Imi pare nespus de rau ca n-am pastrat caietele de ar'metica din generala.

Si lucrarea "stiintifica"

http://www.youtube.com/results?search_quer...peratiilor&aq=f

Conform tipei care vorbeste acolo, ordinea operatiunilor e ca si miorita, se transmite din generatie in generatie.

Ar fi putut sa-si raceasca gura si sa mentioneze ca inmultirile si impartirile sunt niste simple substituiri ale unor adunari sau scaderi repetitive. Parantezele indeplinesc si ele tot un rol de grupare. (poate o facut-o, n-am avut rabdare sa-i urmaresc toate trei filmuletele)

Ei, aceste minunate substituiri(*) sunt motivul ordinii operatiunilor aritmetice.

(*)sau mai bine zis, simplificari de notatie. Cine nu ma crede, sa calculeze 123 * 321 prin adunari succesive tongue.gif

L.E.
Imi place cum se c*ca pe ei cu ordinea operatiunilor de acelasi rang.
Adica 1+ 2 + 3 = 3 + 3 = 6.
Da, asa este irelevant, dar daca ai

13 + 5 + 7 + 25 , termini mult mai iute daca le grupezi cate doua, 13 cu 7 si 5 cu 25. Daca te pui sa respecti regula, memorezi adunand. Daca reordonezi elementele, raspunzi instant. Evident, acelasi lucru e valabil si pentru inmultiri / impartiri.

Dar de, la noi, o vanzatoare care sta de 3 ani in aceeasi maghernita si inca aduna cu calculatorul 2 pachete de tigari de 10.60, se uita socata la mine cand ii spun ca nu, nu-i 26.60. Oricum, am o placere sadica sa le cer bon dupa ce au terminat de adunat cu calculiciul.

This post has been edited by bucatzel: 18 Apr 2011, 17:28


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ArtVandelay
post 18 Apr 2011, 17:21
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http://www.google.ro/search?q=48%C3%B72%28...9b40821dfc0fb20

s-a discutat ceva pe tema asta.. blink.gif

http://www.youtube.com/results?search_quer...289%2B3%29&aq=f

This post has been edited by ArtVandelay: 18 Apr 2011, 17:25


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C a t a l i n
post 18 Apr 2011, 17:24
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Dacă și un simplu calcul matematic stârnește așa discuții, e clar că vine sfârșitul lumii...


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iulian'71
post 19 Apr 2011, 15:16
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Nu un calcul aritmetic simplu deschide discutii ci ca am inceput sa vedem totul complex si alegem mereu variantele mai putin simple in rezolvarea treburilor banale de zi cu zi.


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soril007
post 10 Jun 2011, 13:46
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288


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yhattori
post 10 Jun 2011, 14:42
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*


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transpus in notatia poloneza inversa , calculul e intuitiv:

48 2 / 9 3 + *


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danu_el
post 10 Jun 2011, 16:16
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48/2(9+3). se simplifica cu 2 si ramane 24 supra 12 = 2


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ag02cws
post 10 Jun 2011, 16:47
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Paranteza nu e la numitor, ci la numarator.
Daca era 48/[2(9+3)], era 2.
In cazul de fata e 288.


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cosmin_2300
post 10 Jun 2011, 20:17
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QUOTE(danu_el @ 10 Jun 2011, 17:16)
48/2(9+3). se simplifica cu 2 si ramane 24 supra 12 = 2
*


Greșit.
Ai 48/2*(9+3). Deci ai 24*12=288.


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danu_el
post 11 Jun 2011, 09:01
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aveti dreptate. 288 e corect


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buntom
post 16 Jul 2011, 07:29
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48:2(9+3)=
48:2*12=
24*12=288 up.gif


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Markos
post 20 Jul 2011, 22:00
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Problema de clasa a patra:

QUOTE
Diferenta dintre inaltimea in cm si greutatea in kg a Dolofanului este 100. Stiind ca aceeasi relatie are loc si in cazul lui Skija iar dublul inaltimii Dolofanului este egal cu triplul inaltimii lui Skija si ca greutatea Dolofanului este de 4 ori mai mare decit greutatea lui Skija sa se afle inaltimea lui Skija si greutatea Dolofanului.


This post has been edited by Markos: 20 Jul 2011, 22:00


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ady77
post 21 Jul 2011, 06:09
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Greutate dolofan 80 kg, inaltime skija120 cm.


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tatabobu
post 21 Jul 2011, 09:37
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Mie mi-a iesit schija la minus doi metri. Cre'ca am gresit pe undeva.

This post has been edited by tatabobu: 21 Jul 2011, 09:38


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Alex4u
post 21 Jul 2011, 09:47
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E o greseala in ecuatia aia laugh.gif


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klaus
post 21 Jul 2011, 10:46
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QUOTE(Markos @ 20 Jul 2011, 23:00)
Problema de clasa a patra:
*


Da' ce se face fratele meu in clasa a IV-a, daca problemele sunt sisteme de 4 ecuatii cu 4 necunoscute care pe drumul rezolvarii se transforma in ecuatii cu fractii?


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Andy_ACS
post 21 Jul 2011, 10:56
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Metoda grafica, cu segmente smile.gif


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Markos
post 21 Jul 2011, 11:04
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exact wink.gif


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dizzy
post 21 Jul 2011, 11:09
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Gd=80kg, Hd=180cm
Gs=20kg, Hs=120 cm.


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Markos
post 21 Jul 2011, 11:12
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QUOTE(tatabobu @ 21 Jul 2011, 10:37)
Mie mi-a iesit schija la minus doi metri.
*


Morbid rezultat wacko.gif


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ady77
post 21 Jul 2011, 11:42
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QUOTE(Andy_ACS @ 21 Jul 2011, 11:56)
Metoda grafica, cu segmente smile.gif
*




QUOTE(Markos @ 21 Jul 2011, 12:04)
exact  wink.gif
*


Shit, eu am facut-o cum a zis klaus.


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Andy_ACS
post 22 Jul 2011, 08:30
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Tu nu esti in clasa a patra smile.gif


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maho
post 22 Jul 2011, 10:16
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Zãu cã n-aveti activitate... smile.gif
1+1= ?
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DannyY
post 22 Jul 2011, 10:25
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Scrii A zecimal? tongue.gif


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ady77
post 22 Jul 2011, 10:36
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QUOTE(maho @ 22 Jul 2011, 11:16)
1+1= ?
*


cat vrei tu icon_mrgreen.gif


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maho
post 22 Jul 2011, 12:21
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Corect, rãmâne doar sã ne alegem sistemul de referintã. Dar la poll, cred cã unii ar fi putut cere ajutorul copiilor. biggrin.gif
App., rãposatu' Ryan Dunn avea tatuat pe picior: 1+1=2, "ca sã nu uite".

This post has been edited by maho: 22 Jul 2011, 12:23


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Marty
post 22 Jul 2011, 13:22
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Io zic ca-i 2.

<span class='edit'>22 Jul 2011, 14:27:</span>
48
2x(9+3)

Daca voua va da asta 288, sunteti zei, v-ati pisat pe Cebîșev

This post has been edited by Marty: 22 Jul 2011, 13:47


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