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Sean los números A y B:
AxB = 1296............................(1)
A+B = 72 ---> A = 72 - B .......(2)
Remplaza (2) en (1):
(72 - B) x B = 1296
72B - B² = 1296
0 = B² - 72B + 1296
Factorizando:
(B - 36)² = 0 ---> B = 36 y A = 72-36 --> A = 36
Nota: si uso -1296 no hay solución entera, te salen números racionales.