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1/a + 1/b = 3/8
(a+b)/(ab) = 3/8 = 12/(ab)
ab = 32
los números son : 8 y 4
(a + b)^2 = 144
a^2 + b^2 + 2ab = 144
a^2 + b^2 +2(32) = 144
a^2 + b^2 = 80
(a-b)^2 = a^2 + b^2 -2ab
=80 - 2(32)
(a-b)^2 = 16
a-b = 4
a + b = 12
sumando
2a =16
a = 8
8 + b =12
b =4