Автор - Tansho

{x+y+xy=11{x2+xy+y2=19

Ответ

Автор - greatnat
{x+xy+y=11
{x²+xy+y²=19

19-11=8=x²+y²-x-y
11-8=3=x
11-3=8-3=5=x+y=>y=2
ответ x=3, y=2

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