+0  
 
0
816
1
avatar

martin tenia ahorado una plata nose sabe cuanto.se gasto 12 pesos, despues gato 3, luego gano la misma cantidad q tenia ahorrado . al final conto la plata y tenia 23 pesos. ¿cuanto tenia ahorado?

 28 mar 2015
 #1
avatar
0

Tenía 19 pesos ahorrados.

Procedimiento: Despejar ("x" equivale a la cantidad de pesos que tenia ahorrados)

$${\mathtt{x}}{\mathtt{\,-\,}}{\mathtt{12}}{\mathtt{\,-\,}}{\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{x}} = {\mathtt{23}}$$

$${\mathtt{x}}{\mathtt{\,-\,}}{\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{x}} = {\mathtt{23}}{\mathtt{\,\small\textbf+\,}}{\mathtt{12}}$$

$${\mathtt{x}}{\mathtt{\,\small\textbf+\,}}{\mathtt{x}} = {\mathtt{23}}{\mathtt{\,\small\textbf+\,}}{\mathtt{12}}{\mathtt{\,\small\textbf+\,}}{\mathtt{3}}$$

(Aquí, $${\mathtt{x}}{\mathtt{\,\small\textbf+\,}}{\mathtt{x}}$$ lo interpreté como $${\mathtt{x}}{\mathtt{\,\times\,}}{\mathtt{2}}$$ ya que es lo mismo)

$${\mathtt{x}}{\mathtt{\,\times\,}}{\mathtt{2}} = {\mathtt{23}}{\mathtt{\,\small\textbf+\,}}{\mathtt{12}}{\mathtt{\,\small\textbf+\,}}{\mathtt{3}}$$

$${\mathtt{x}} = {\frac{\left({\mathtt{23}}{\mathtt{\,\small\textbf+\,}}{\mathtt{12}}{\mathtt{\,\small\textbf+\,}}{\mathtt{3}}\right)}{{\mathtt{2}}}}$$

$${\mathtt{x}} = {\mathtt{19}}$$

 29 mar 2015

0 Usuarios en línea