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∴a/b +b/a⇒a²+b²/ab
a+b=2ab
↓
a+b=2(3)
a+b=6...(Elevando al cuadrado ambos terminos)
(a+b)²=6²
a²+2ab+b²=36...⇒ab=3(Reemplazar)
a²+b²+2(3)=36
a²+b²+6=36
a²+b²=36-6
a²+b²=30 ∧ab=3
∴a²+b²/ab⇒30/3=10