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Sean los números a y b
a + b = 11/12
a - b = 5 / 12
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2 a = 16/12
a = 16 / 24 = 8/12
Si a = 8 /12
b = 11/12 - a
b = 11/12 - 8/12 = 3/12
b = 3 /12
Los números son 8 /12 y 3/12