x-y=15
x^2-y^2=615; (x-y)(x+y)=615;
15*(x+y)=615; x+y=41;
x=15+y; 15+2y=41; 2y=26; y=13;
x=15+13; x=28
Отве28 и 13
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x-y=15
x^2-y^2=615; (x-y)(x+y)=615;
15*(x+y)=615; x+y=41;
x=15+y; 15+2y=41; 2y=26; y=13;
x=15+13; x=28
Отве28 и 13