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Área del cubo = 6a²
Diagonal de una cara = a√2
Diagonal del cubo = a√3.
Entonces pide un número "X" que cumpla con:
X.(6a²) = (a√2)² + (a√3)²
6Xa² = 2a² + 3a²
6Xa² = 5a² Se van las "a²"
6X = 5
X = 5/6. RESPUESTA.