January 2019 1 73 Report
( (\frac{ a^{2} -ab }{ a^{2}b + b^{3} } - \frac{2 a^{2} }{ b^{3} - ab^{2} + a^{2}b - a^{3}})*(1- \frac{b-a}{a} - \frac{b}{ a^{2} })


Odp. a+1/ab

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