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Sagot :
Usando proporciones, se encuentra que al final de la primera hora, el congelador tenía una temperatura de -1ºC.
- Este problema se resuelve por proporciones.
- En 3 horas, la temperatura bajó 12ºC, puesto que [tex]3 - (-9) = 12[/tex].
La temperatura del congelador bajó en la misma cantidad de grados cada hora, o sea, en la primera hora, la cantidad que bajo es:
[tex]\frac{12}{3} = 4[/tex]
4ºC bajo a 3ºC es:
[tex]3 - 4 = -1[/tex]
O sea, al final de la primera hora, el congelador tenía una temperatura de -1ºC.
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