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a² + b² = 25
(a + b)² = a² + 2ab + b² = 25 + 24 =49 --> a + b = 7
(a - b)² = a² - 2ab +b² = 25 - 24 = 1 -----> a - b = 1
Sumamos
a + b + a - b = 7 + 1
2a =8
a = 4
b = 3