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a - b = 2
a² - b² = 48
(a + b ) ( a - b) = 48
(a + b ) . 2 = 48
a + b = 24
a + b = 24
a - b = 2
2a = 26 sehingga a = 13
akibatnya b = 11
jadi bilangan itu adalah 11 dan 13