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X=2^77-2^76-2^75
Y=3^52-2(3^51-3^50)
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Răspuns :

x=2⁷⁵(2²-2-1)=2⁷⁵(4-2-1)=2⁷⁵·1=2⁷⁵

y=3⁵²-2·3⁵⁰(3-1)=3⁵²-2·3⁵⁰·2=3⁵⁰(3²-4)=3⁵⁰·(9-4)=3⁵⁰·5