December 2018 1 35 Report
Wykaż że jeśli
x^{-1} + y^{-1} + z^{-1} =1
oraz
a x^{3} = b y^{3} =c z^{3}
to
 \sqrt[3]{a} + \sqrt[3]{b} + \sqrt[3]{c} = \sqrt[3]{a x^{2} + b y^{2} +c z^{2} }

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