Author Topic:   Cerere tema Matematica  (Read 2061 times)

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Offline xCristi™

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Cerere tema Matematica
« on: 12 November 2014, 09:45:16 »
Nume:Cristi
Tip (eseu, lectie, etc.):Probleme cu Ecuatii.
Materie:Mate.
O persoana cheltuieste in prima zi 1/3 din suma pe care o are. A doua zi cheltuieste 1/2 din rest si inca 45 lei. Ce suma a avut la inceput daca dupa a
doua zi i-au mai ramas 105 lei?
« Last Edit: 01 June 2015, 16:37:32 by ×X×_vasya_×X× »

Offline ×X×_vasya_×X×

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Re: Tema Mate cu ecuatii.
« Reply #1 on: 12 November 2014, 19:09:43 »
Notam prin "X" suma de lei

1 ZI | Cheltuieste 1/3 suma adica din X . Si restul ramane 2X/3 .
1 ZI | Cheltuieste 1/2 din rest adica din 2X/3 si ii ramane X/3.
45 lei ii vom adauga la restul de 105 lei , 45+105=150 lei .
X/3=150
X=450

Raspuns : Suma initiala a fost de 450 lei .


"Nu e obligatoriu să fii de acord cu mine. Dar ar fi mai rapid aşa."




Offline xCristi™

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Re: Tema Mate cu ecuatii.
« Reply #2 on: 12 November 2014, 21:24:59 »
Fi putzin mai explicit adica.. de unde ii ramane si astea.. cum de a disparut 2 de la 2x ?

Offline FaLLenGirL

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Re: Tema Mate cu ecuatii.
« Reply #3 on: 13 November 2014, 10:56:15 »
Pai dispare 2 ptr ca a simplificat acolo cand e 1/2 ori 2x/3 simplifica 2 cu 2 si ramane 1x/3 adica x/3 :P
« Last Edit: 13 November 2014, 10:58:13 by DubStep »

 

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