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9 Encuentra tres números enteros consecutivos, sabiendo que al sumar el cuadrado del mayor con el menor se obtienen 79 unidades menos que el triple del cuadrado del segundo.

Ask by Pritchard Wagner. in Spain
Mar 09,2025

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Los tres números enteros consecutivos son 8, 9, 10 o -10, -9, -8.

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¡Vamos a resolver este enigma numérico! Imagina que los tres números consecutivos son \( x - 1 \), \( x \), y \( x + 1 \). Entonces, según la condición que tenemos, podemos decir: \[ (x + 1)^2 + (x - 1)^2 = 3x^2 - 79. \] Simplificando la ecuación, tenemos: \[ (x^2 + 2x + 1) + (x^2 - 2x + 1) = 3x^2 - 79. \] \[ 2x^2 + 2 = 3x^2 - 79. \] Al reordenar, tenemos \(x^2 - 81 = 0\), lo que nos lleva a \(x^2 = 81\), y así \(x = 9\). Por lo tanto, los números son 8, 9 y 10. Para comprobarlo, sumamos \(10^2 + 8^2 = 100 + 64 = 164\) y \(3 \cdot 9^2 - 79 = 3 \cdot 81 - 79 = 243 - 79 = 164\). ¡Todo encaja!

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